In the Philippines, the phrase "it's complicated" carries significant legal weight. Because the country remains the only state in the world (aside from the Vatican) without a general divorce law, "separated" does not mean "single." Whether a person is de facto separated (simply living apart) or legally separated by a court decree, the marital bond remains intact.

Engaging in a romantic relationship with a person whose marriage has not been civilly annulled or declared void ab initio exposes both parties to serious criminal and civil liabilities.

1. Criminal Liabilities under the Revised Penal Code (RPC)

The most immediate threats are the crimes against chastity. Philippine law distinguishes between infidelity committed by a wife and that committed by a husband.

Adultery (Article 333)

If a man dates a married woman, he can be charged with Adultery.

The Offense: Committed by a married woman who has sexual intercourse with a man not her husband, and by the man who has carnal knowledge of her knowing her to be married.
The Risk: Each sexual act is a separate crime. The man does not need to be married himself; his knowledge of her marital status is enough to convict him.
Penalty: Prision correccional in its medium and maximum periods (2 years, 4 months, and 1 day to 6 years).

Concubinage (Article 334)

If a woman dates a married man, the charge is Concubinage. This is generally harder to prove than adultery due to specific legal requirements.

The Offense: Committed by a married husband who:
1. Keeps a mistress in the conjugal dwelling;
2. Has sexual intercourse under scandalous circumstances; or
3. Cohabits with her in any other place.
The Risk: Simple sexual intercourse is not enough for a concubinage conviction; there must be proof of "cohabitation" (living together as husband and wife) or "scandalous circumstances."
Penalty: The husband faces prision correccional in its minimum and medium periods. The concubine (the third party) faces the penalty of destierro (banishment from a specific radius for a set period).

2. Violation of R.A. 9262 (VAWC)

The Anti-Violence Against Women and Their Children Act of 2004 has become a powerful tool for abandoned or aggrieved spouses.

Psychological Violence: The Supreme Court has ruled that marital infidelity can constitute psychological violence. If the extramarital affair causes "emotional or psychological suffering" to the legal wife, the husband can be prosecuted under R.A. 9262.
The Third Party’s Role: While the law primarily targets the "intimate partner" (the husband), the third party can be implicated if they are seen as a conspirator in causing the psychological trauma. Conviction under this law carries heavier penalties than concubinage and is non-bailable in certain instances.

3. Comparison of Infidelity Crimes

Feature	Adultery (Against the Wife)	Concubinage (Against the Husband)
Proof Required	A single act of sexual intercourse.	Cohabitation, mistress in the home, or scandalous sex.
Penalty for 3rd Party	Prison time (Prision Correccional).	Banishment (Destierro).
Gender Bias	Easier to prosecute.	Harder to prosecute.

4. Property and Financial Risks

Dating a separated person often leads to "commingling" of assets, which can be a financial nightmare.

Presumption of Conjugal Ownership: Under the Family Code, properties acquired during the marriage are presumed to be part of the Absolute Community of Property (ACP) or Conjugal Partnership of Gains (CPG).
The "Mistress" Rule: Article 148 of the Family Code governs property relations in "adulterous" unions. Only the properties acquired through actual joint contribution of money, property, or industry shall be owned in common. However, if one party is married, their share in the co-ownership often forfeited in favor of their legal spouse or their common children.
Donations and Gifts: Under Article 739 of the Civil Code, donations made between persons who were guilty of adultery or concubinage at the time of the donation are void. The legal spouse can sue to recover any expensive gifts (cars, condos, jewelry) given to the third party.

5. The Crime of Bigamy (Article 349)

If the separated person and their new partner attempt to marry—perhaps through a "fake" marriage license or by claiming to be single in a different jurisdiction—they commit Bigamy.

Penalty: Prision mayor (6 years and 1 day to 12 years).
Status of the Second Marriage: The second marriage is considered void from the beginning (void ab initio), providing no legal protection or rights to the new partner.

6. Civil Damages

Even if a criminal case is not filed, the legal spouse can sue the third party for Civil Damages under the Civil Code:

Article 26: Every person shall respect the dignity, personality, privacy, and peace of mind of their neighbors and other persons.
Article 2219: Moral damages may be recovered in cases of "adultery or concubinage."

The "alienation of affection" or simply the disruption of the peace of the legal family can be grounds for a massive financial judgment against the third party.

7. Impact on Children and Successional Rights

Illegitimate Status: Children born from a relationship where one parent is still married to someone else are considered illegitimate. While they have rights to support and a certain percentage of inheritance (legitime), their successional rights are only half that of a legitimate child.
Custody Battles: The existence of an "immoral" relationship is often used as a ground to declare a parent "unfit," potentially leading to the loss of custody of children from the previous (legal) marriage.

Summary Note: In the Philippines, separation is a physical state, but marriage is a legal permanence. Until a Final Decree of Nullity or Annulment is issued by a court and registered with the Civil Registrar, any romantic involvement with a separated person is legally classified as an extramarital affair, carrying the full weight of the country’s conservative penal and civil laws.