There’s more than one path to rebuilding trust after a spouse’s betrayal. One is to create a postnuptial agreement, colloquially known as a postnup. A postnuptial agreement, which a couple enters into after marriage, can offer similar reassurances to a prenuptial agreement (prenup), which a couple enters into before marriage.

The main difference is timing and the scrutiny a postnup might face based on the laws of the presiding jurisdiction, should there be a challenge. Given the increased potential for power imbalances between spouses once they’re married and the duress one spouse could face from the other, a postnuptial agreement can be effective in helping couples rebuild after betrayal when used with good intentions by both spouses.

It’s worth noting that a betrayal, such as an affair or an undisclosed addiction, isn't necessarily rooted in finances. However, betrayal of any kind could impact a couple’s financial situation, which a postnup can help ward against. This includes but is not limited to

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