A spouse having a new girlfriend, boyfriend, or live-in partner while married is painful and may be legally important, but it does not automatically void the marriage in the Philippines. Under Philippine law, “voiding” a marriage usually means filing a court case for declaration of nullity or annulment, and those remedies require specific legal grounds. Infidelity, even while one spouse is in jail, is more commonly a ground for legal separation, a possible criminal complaint, or evidence in a psychological incapacity case only if it proves something deeper than ordinary cheating.

The key question is not simply, “Did my spouse get a new partner?” The better legal question is: What remedy fits the facts — declaration of nullity, annulment, legal separation, criminal case, protection order, support, custody, or property protection?

The direct answer: cheating while married does not automatically make the marriage void

In the Philippines, a marriage remains legally valid until a competent court says otherwise. Even if your spouse is in jail, has a new partner, posts about the relationship online, or admits to cheating, that alone does not cancel the marriage.

This is because the Family Code of the Philippines separates marriage problems into different legal categories:

Situation	Possible legal remedy	Does it end the marriage bond?
The marriage was legally defective from the start	Declaration of nullity	Yes, after final court judgment and proper registration
The marriage was valid but voidable due to a ground existing at the time of marriage	Annulment	Yes, after final court judgment and proper registration
Spouse committed sexual infidelity, contracted a bigamous marriage, was sentenced to imprisonment of more than 6 years, or abandoned the family	Legal separation	No
Spouse’s infidelity is part of a proven psychological incapacity existing at the time of marriage	Possible declaration of nullity under Article 36	Yes, if proven by clear and convincing evidence
Spouse committed adultery, concubinage, bigamy, or VAWC-related psychological violence	Criminal case, depending on facts	No, by itself

The Family Code lists void marriages under Articles 35, 36, 37, and 38. These include, among others, marriages without a valid license, bigamous marriages, incestuous marriages, and marriages where a party was psychologically incapacitated at the time of the wedding. A spouse’s later infidelity is not listed by itself as a ground that makes the marriage void from the beginning. (Lawphil)

“Void marriage,” “annulment,” and “legal separation” are not the same

Many people use the word “annulment” to mean any court case that ends a marriage. In Philippine practice, however, the labels matter.

Declaration of nullity

A declaration of nullity is used when the marriage is considered void from the beginning. Common grounds include:

no valid marriage license, unless exempted by law;
unauthorized solemnizing officer, except when there was good-faith belief in authority;
bigamous or polygamous marriage;
mistake as to identity;
incestuous marriage;
psychological incapacity under Article 36.

A petition for declaration of absolute nullity may be filed solely by the husband or wife, must be filed in the Family Court, and does not prescribe. The petition must allege the complete facts showing the basis for nullity, especially in Article 36 cases. (Lawphil)

Annulment

An annulment applies to a marriage that was valid when celebrated but can be annulled because of a ground existing at the time of marriage. Article 45 of the Family Code lists the grounds, including lack of required parental consent, unsound mind, fraud, force or intimidation, incurable physical incapacity to consummate the marriage, or serious incurable sexually transmissible disease. Article 46 explains the kinds of fraud that count, such as concealment of a prior conviction involving moral turpitude, pregnancy by another man at the time of marriage, sexually transmissible disease, drug addiction, habitual alcoholism, or homosexuality or lesbianism existing at the time of marriage. (Lawphil)

A spouse’s new partner years after the wedding is usually not an annulment ground, unless the facts connect to a legal ground that already existed when the marriage was entered into.

Legal separation

Legal separation allows spouses to live separately and may dissolve and liquidate their property regime, but it does not sever the marriage bond. This means legally separated spouses still cannot remarry.

This is the remedy most directly connected to a spouse’s later misconduct. Article 55 of the Family Code includes as grounds for legal separation:

final judgment sentencing the respondent spouse to imprisonment of more than 6 years, even if pardoned;
contracting a subsequent bigamous marriage, whether in the Philippines or abroad;
sexual infidelity or perversion;
abandonment without justifiable cause for more than 1 year;
repeated physical violence or grossly abusive conduct;
attempt against the life of the petitioner. (Lawphil)

Legal separation must generally be filed within 5 years from the occurrence of the cause. The case cannot be tried before 6 months have passed from filing, and the court must take steps toward reconciliation unless reconciliation is clearly improbable. (Lawphil)

When can a spouse’s new partner matter in a nullity case?

A spouse’s new relationship may become relevant in a declaration of nullity case under Article 36 psychological incapacity, but only if the evidence shows more than ordinary infidelity.

Article 36 covers a marriage where one party, at the time of the celebration of the marriage, was psychologically incapacitated to comply with essential marital obligations, even if the incapacity became obvious only later. (Lawphil)

The Supreme Court’s modern approach in Tan-Andal v. Andal explains that psychological incapacity is a legal concept, not necessarily a medical illness. It involves clear acts of dysfunctionality showing lack of understanding and compliance with essential marital obligations due to psychic causes; expert testimony is not always required. (Supreme Court E-Library)

But the standard remains serious. In Article 36 cases, the petitioner must prove psychological incapacity by clear and convincing evidence, a higher standard than the usual civil standard. (Supreme Court E-Library)

Infidelity alone is usually not enough

The Supreme Court has repeatedly warned that sexual infidelity, abandonment, immaturity, or irresponsibility do not automatically prove psychological incapacity. In Dedel v. Court of Appeals, the Court held that sexual infidelity or perversion and abandonment, by themselves, do not constitute psychological incapacity; at most, they may be grounds for legal separation under Article 55. (Supreme Court E-Library)

So if the only proof is “my spouse now has a new partner,” the stronger legal fit is often legal separation or a criminal/protection-related remedy, not nullity.

When infidelity may support Article 36

Infidelity may support an Article 36 petition when it is part of a larger, well-documented pattern showing that the spouse was already psychologically incapable of being a present, faithful, respectful, supportive spouse from the start of the marriage.

Examples that may matter:

repeated affairs from the beginning of the marriage;
total refusal to support the family despite ability to do so;
persistent abandonment of spouse and children;
severe manipulation, abuse, or compulsive destructive conduct;
credible testimony from relatives, friends, children, or professionals who observed the spouse before and during the marriage;
documents showing the pattern existed before or around the wedding, not only after the jail sentence.

Tan-Andal requires juridical antecedence, meaning the incapacity must have existed at the time of marriage, even if it became fully visible only later. This is what separates psychological incapacity from ordinary legal separation or divorce-type grounds. (Supreme Court E-Library)

What if your spouse is in jail?

Jail or imprisonment changes the practical handling of the case, but it does not automatically void the marriage.

If your spouse was sentenced to more than 6 years

If there is a final judgment sentencing your spouse to imprisonment of more than 6 years, that is a specific ground for legal separation under Article 55(4) of the Family Code, even if the spouse is later pardoned. (Lawphil)

Important details:

The conviction must be by final judgment.
The sentence must be more than 6 years.
This is for legal separation, not automatic nullity.
You still need to file a court petition.

If the spouse in jail has a new partner

If your incarcerated spouse has a romantic or sexual relationship, the legal consequences depend on the facts:

If there is proof of sexual infidelity, it may support legal separation.
If the spouse contracted a second marriage while your marriage is still subsisting, that may be bigamy and the second marriage may be void.
If the relationship caused psychological violence to a wife or child, RA 9262 may apply, depending on proof.
If the conduct forms part of a long-standing pattern of incapacity existing from the time of the marriage, it may be evidence in an Article 36 case.

In practice, a jail setting also affects service of summons and evidence gathering. The petition should identify the respondent’s place of detention, jail facility, bureau or jail management office, and available prisoner information so court processes can be served properly.

Possible criminal cases: adultery, concubinage, bigamy, and VAWC

A criminal case does not automatically end a marriage, but it may protect rights, create leverage for support or custody issues, and provide court findings relevant to other proceedings.

Adultery and concubinage

Under Article 333 of the Revised Penal Code, adultery is committed by a married woman who has sexual intercourse with a man not her husband, and by the man who knows she is married. Under Article 334, concubinage is committed by a husband who keeps a mistress in the conjugal dwelling, has sexual intercourse under scandalous circumstances with a woman not his wife, or cohabits with her elsewhere. (Lawphil)

Article 344 adds an important rule: adultery and concubinage cannot be prosecuted except upon a complaint filed by the offended spouse. The offended spouse must include both guilty parties if both are alive, and prosecution is barred if the offended spouse consented to or pardoned the offenders. (Lawphil)

This is why “I have screenshots” is often not enough. Prosecutors usually look for proof of the legal elements, not just emotional betrayal.

Bigamy

If your spouse marries the new partner while your marriage still exists and there is no final court judgment allowing remarriage, bigamy may be involved. The Family Code declares bigamous or polygamous marriages void from the beginning, subject to the special rules on presumptive death under Article 41. (Lawphil)

A second marriage can create two tracks:

a criminal bigamy complaint under the Revised Penal Code; and
a civil petition concerning nullity or legal separation, depending on the remedy needed.

RA 9262 and psychological violence

For women and children, marital infidelity can sometimes be prosecuted as psychological violence under Republic Act No. 9262, the Anti-Violence Against Women and Their Children Act of 2004, when it causes mental or emotional anguish and the legal elements are proven. The Supreme Court has upheld VAWC liability in a case where a husband cohabited with another woman and impregnated her while his wife was working abroad. (Supreme Court of the Philippines)

However, the Supreme Court has also clarified that RA 9262 does not punish marital infidelity per se; what the law punishes is psychological violence causing mental or emotional suffering, which must be proven through the victim’s experience and evidence. (Supreme Court E-Library)

Practical step-by-step guide if your spouse has a new partner while in jail

1. Identify your goal first

Before choosing a case, be clear about what you need:

Your goal	More suitable remedy
End the marriage bond and be able to remarry	Declaration of nullity or annulment, if a legal ground exists
Live separately, divide property, protect inheritance rights, but not remarry	Legal separation
Punish a spouse or new partner for a crime	Criminal complaint
Protect a woman or child from emotional, physical, economic, or psychological abuse	Barangay protection order, temporary/permanent protection order, or VAWC case
Get money for children or spouse	Support case or provisional support in the family case
Protect property from being sold or dissipated	Provisional orders, property annotation, injunction, receivership, or administration orders

2. Secure civil registry documents

For a marriage case, courts commonly require:

PSA-issued Certificate of Marriage;
PSA Advisory on Marriages;
birth certificates of common children;
marriage settlement, if any;
proof of residence or venue;
proof of the spouse’s jail address or detention facility;
prior court decisions, if any;
documents showing conviction and finality, if relying on imprisonment;
evidence of infidelity, bigamous marriage, abandonment, abuse, or psychological incapacity.

Family Court jurisdiction over annulment, declaration of nullity, marital status, property relations, support, and related family matters comes from Republic Act No. 8369, the Family Courts Act of 1997. (Lawphil)

3. Preserve evidence carefully

Useful evidence may include:

certified true copies of criminal judgments and certificates of finality;
jail records, if relevant and legally obtainable;
birth certificate of a child with the new partner;
photos, messages, travel records, remittances, public posts, and admissions;
affidavits from people with personal knowledge;
proof of cohabitation;
proof of support being diverted to the new partner;
medical, psychological, or counseling records, where relevant;
barangay blotter, police report, VAWC desk record, or protection order record.

Avoid hacking accounts, stealing passwords, secretly recording privileged communications, or fabricating conversations. Illegally obtained evidence can create new problems.

4. Choose the correct court or office

Matter	Where it usually starts
Declaration of nullity or annulment	Family Court / designated RTC
Legal separation	Family Court / designated RTC
Adultery or concubinage	Prosecutor’s Office, after complaint-affidavit
Bigamy	Prosecutor’s Office
VAWC protection	Barangay, Family Court, or criminal justice channels depending on remedy
PSA annotation after final court decree	Local Civil Registry Office and PSA

5. Expect court scrutiny

Marriage cases are not supposed to be granted just because both spouses agree. Article 48 of the Family Code requires the prosecuting attorney or fiscal to appear for the State to prevent collusion and fabricated evidence. No judgment may be based simply on a stipulation of facts or confession of judgment. (Lawphil)

This is why uncontested does not mean automatic. Even if the jailed spouse does not appear, the petitioner still needs admissible, credible evidence.

6. Register the final judgment before relying on it

A favorable decision is not the end of the process. Under Articles 52 and 53 of the Family Code, the judgment of annulment or absolute nullity, partition and distribution of properties, and delivery of presumptive legitimes must be recorded in the appropriate civil registry and registries of property; remarriage requires compliance with these registration requirements. (Lawphil)

For PSA annotation, the PSA lists supporting documents such as the court decree of annulment or declaration of nullity, certificate of finality, certificate of registration, certificate of authenticity, unannotated marriage certificate, and annotated marriage certificate from the local civil registry. (Philippine Statistics Authority)

Special issues for Filipinos abroad and foreigners

If the petitioner is abroad

A Filipino abroad can still pursue a Philippine family case, but residence and document authentication are common bottlenecks. In 2023, the Office of the Court Administrator issued guidance that an affidavit of residency executed by a petitioner temporarily residing abroad for work, business, education, or another purpose, duly authenticated by the appropriate Philippine Consulate, may be sufficient compliance with residency requirements in nullity, annulment, and legal separation petitions.

Practical documents may need:

consular acknowledgment;
apostille or authentication for foreign public documents;
certified translations if documents are not in English;
proof of foreign address and Philippine residence;
Special Power of Attorney, if someone in the Philippines will obtain records or coordinate filings.

If one spouse is a foreigner

If the case involves a Filipino and a foreigner, a foreign divorce may matter under Article 26 of the Family Code. The Supreme Court in Republic v. Manalo recognized that the effects of a valid foreign divorce obtained under the foreign spouse’s national law may be extended to the Filipino spouse, to avoid the unfair situation where the foreign spouse is free to remarry while the Filipino remains married. (Supreme Court E-Library)

The Supreme Court has also ruled that foreign divorces need not be only court decrees abroad; they may be recognized if valid under the foreign spouse’s national law, including administrative or mutual-agreement divorces, but the relevant foreign law and divorce document must still be properly proven in Philippine court. (Supreme Court of the Philippines)

If the marriage is governed by Muslim personal law

For Muslim marriages covered by Presidential Decree No. 1083, the Code of Muslim Personal Laws, different rules on marriage and divorce may apply. The Code applies to marriage and divorce where both parties are Muslims, or where only the male party is Muslim and the marriage was solemnized under Muslim law or the Code. (Lawphil)

Common mistakes that hurt these cases

Mistake 1: Filing nullity when the facts only support legal separation

If the only issue is that the spouse cheated after marriage, a nullity case may fail. The court will look for a defect existing from the beginning or psychological incapacity that existed at the time of marriage.

Mistake 2: Thinking legal separation allows remarriage

Legal separation does not cut the marriage bond. Article 63 expressly says the spouses may live separately, but the marriage bonds are not severed. (Lawphil)

Mistake 3: Relying only on screenshots

Screenshots may help, but courts and prosecutors usually need authentication, context, and proof of the legal elements. A photo with another person may prove closeness, not necessarily sexual infidelity, cohabitation, psychological violence, or bigamy.

Mistake 4: Waiting too long for legal separation

Legal separation must be filed within 5 years from the occurrence of the cause. Delay can also create arguments about condonation, consent, or pardon. (Lawphil)

Mistake 5: Remarrying after a “fake annulment” or unannotated decision

A court decision must become final and must be properly registered and annotated. Without proper registration, the PSA record may still show the person as married, and remarriage can create serious civil and criminal issues.

Frequently Asked Questions

Can I void my marriage because my spouse has a new partner while in jail?

Usually, no. A new partner is not by itself a ground to void a marriage. It may support legal separation, a criminal complaint, VAWC remedies, or an Article 36 nullity case only if it proves a deeper psychological incapacity existing at the time of marriage.

Is cheating a ground for annulment in the Philippines?

Cheating after marriage is generally not an annulment ground. Annulment grounds under Article 45 must exist at the time of marriage, such as fraud, force, unsound mind, incurable physical incapacity, or serious incurable sexually transmissible disease.

Is sexual infidelity a ground for legal separation?

Yes. Article 55 of the Family Code specifically includes sexual infidelity or perversion as a ground for legal separation. But legal separation does not allow remarriage.

If my spouse is sentenced to prison, can I end the marriage?

A final judgment sentencing your spouse to imprisonment of more than 6 years is a ground for legal separation. It does not automatically void the marriage and does not by itself allow remarriage.

Can I file bigamy if my spouse married the new partner?

Yes, if your prior marriage was still legally subsisting and your spouse entered a second marriage without a valid legal basis. Bigamy is separate from a civil case for nullity, annulment, or legal separation.

Can I file adultery or concubinage against the new partner too?

Possibly, depending on the facts. Article 344 of the Revised Penal Code requires the offended spouse to file the complaint and include both guilty parties if both are alive. The exact charge depends on whether the offending spouse is the wife or husband and whether the legal elements are present.

Can my jailed spouse sign papers agreeing to annulment?

The spouse may participate in the case, but agreement alone is not enough. Philippine courts cannot grant nullity, annulment, or legal separation based only on confession of judgment, stipulation of facts, or collusion.

What if my spouse had the new partner even before we got married?

That may be more relevant. If the facts show fraud existing at the time of marriage, or a long-standing psychological incapacity already present when the marriage was celebrated, the facts may support annulment or declaration of nullity depending on the evidence.

Can I remarry after legal separation?

No. Legal separation allows spouses to live separately and affects property, custody, inheritance, and donations, but the marriage bond remains.

How long does a nullity or annulment case usually take?

Timelines vary widely by court, location, evidence, service of summons, availability of witnesses, prosecutor participation, and whether the respondent contests the case. A straightforward uncontested case may still take many months to several years; contested cases, cases involving overseas parties, jailed respondents, property disputes, or custody issues often take longer.

Key Takeaways

A spouse having a new partner while married, even while in jail, does not automatically void the marriage.
Infidelity is more directly a ground for legal separation, not annulment or nullity.
Legal separation lets spouses live apart but does not allow remarriage.
A prison sentence of more than 6 years by final judgment is a legal separation ground, not automatic nullity.
Article 36 psychological incapacity may apply only when the new relationship is part of a deeper incapacity existing at the time of marriage and proven by clear and convincing evidence.
Adultery, concubinage, bigamy, and VAWC may be available depending on the facts, but criminal cases do not by themselves end the marriage.
A final court judgment must be registered with the civil registry and PSA before a person can safely rely on it for civil status and remarriage purposes.