In the Philippines, where marriage is constitutionally protected as an "inviolable social institution," the law provides a complex, often overlapping web of remedies for the aggrieved spouse. While the country remains one of the last in the world without a general divorce law as of May 2026, the legal landscape for addressing "marital indiscretion" has evolved through landmark Supreme Court rulings and special statutes.

If you are dealing with suspected or proven infidelity, here is the current legal framework governing your options.

I. Criminal Remedies: The RPC Framework

The Revised Penal Code (RPC) treats marital infidelity as a private crime. This means the State will not prosecute unless the offended spouse personally files the complaint.

1. Adultery (Art. 333)

Applies to: Wives and their paramours. Adultery is 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.

Proof: You only need to prove a single act of sexual intercourse.
Penalty: Prision correccional (6 months and 1 day to 6 years).

2. Concubinage (Art. 334)

Applies to: Husbands and their mistresses. The law sets a higher bar for "Concubinage" than for "Adultery." A husband is only liable if he:

Keeps a mistress in the conjugal dwelling;
Has sexual intercourse with her under scandalous circumstances; or
Cohabits with her in any other place.

Penalty: Generally lower than adultery for the husband, while the mistress is only sentenced to destierro (banishment from a specific radius).

Note: As of the latest 2026 jurisprudence (e.g., Chua-Chiba v. Chiba), the Supreme Court emphasizes that the offended spouse cannot delegate the filing of these cases to a representative; the "right to forgive or prosecute" is strictly personal.

II. The "Psychological Violence" Route: RA 9262

The Anti-Violence Against Women and Their Children Act of 2004 (RA 9262) has become the most potent tool for wives. Under Section 5(i), causing "mental or emotional anguish" through marital infidelity is classified as Psychological Violence.

The 2024 Shift: In XXX v. People (G.R. No. 252739), the Supreme Court ruled that in cases of infidelity, criminal intent to cause emotional suffering is automatically presumed. The prosecution no longer needs to prove the husband "intended" to hurt the wife; the act of cheating is considered inherently injurious.
Remedy: A wife can apply for a Protection Order (PPO/TPO) to remove the husband from the home or prevent further contact, alongside criminal charges.

III. Civil and Marital Status Remedies

Since absolute divorce is not yet codified in the Philippines, spouses must choose between "separating the assets" or "nullifying the bond."

1. Legal Separation (Family Code, Art. 55)

Sexual infidelity is a valid ground for legal separation.

Result: The spouses live separately and the property is liquidated.
Catch: Neither spouse can remarry. The marital bond remains "active" in the eyes of the law.

2. Declaration of Absolute Nullity (Art. 36)

While infidelity itself is not a ground for annulment, repeated infidelity is often used as a primary symptom of Psychological Incapacity.

Modern Standard: Following the landmark Tan-Andal v. Andal ruling, psychological incapacity is now a legal concept, not a medical one. You no longer need a psychiatrist to testify that your spouse has a "personality disorder." You only need to prove through the "totality of evidence" that the spouse’s infidelity is a manifestation of an inability to comply with essential marital obligations (fidelity, mutual help, and support).

IV. Administrative and Civil Damages

Beyond prison time or separation, infidelity carries heavy collateral consequences:

Civil Damages (Art. 26, Civil Code): The offended spouse can sue for moral damages based on the "willful injury to personality" and "acts contrary to morals."
Administrative Sanctions: If the erring spouse is a lawyer, doctor, or government employee, infidelity is grounds for disbarment, revocation of license, or dismissal from service due to "immorality" or "conduct prejudicial to the best interest of the service."
Forfeiture of Assets: In a decree of legal separation, the "guilty spouse" may forfeit their share of the net profits of the conjugal partnership.

Summary of Options

Remedy	Objective	Remarriage Possible?
Criminal (Adultery/Concubinage)	Imprisonment of the spouse/paramour.	No.
RA 9262 (VAWC)	Protection orders and imprisonment for psychological abuse.	No.
Legal Separation	Separation of bed, board, and assets.	No.
Nullity (Art. 36)	Declaring the marriage void from the start.	Yes.

A Final Word of Caution: In Philippine law, pardon is a total bar to prosecution. If you suspected infidelity but continued to cohabit or "slept on the issue" after discovery, the court may deem you to have impliedly pardoned the offense, stripping you of your right to file criminal charges.