No, the prenup is not invalid. The fact of him cheating just gives you grounds to file the divorce. I would like to see what you agree to in the prenup to better advise you as to what to do. However, I suspect you merely agreed to how would divide your property should you separate, and not put any sort of clause in the agreement as to what would happen should one party commit adultery. So, sounds like you will be bound by the agreement, but I would like a chance to look at your agreement.
The pre-nup should define the asset allocation upon your divorce-it would not become void upon infidelity.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.
Prenups only cover how property is distributed in case of divorce. Some will cover adultery as a condition of a more favorable distribution to the other party. However, the document is not made invalid by adultery or any other grounds for the divorce.
Contact an attorney to review your case. Adultery requires a higher level of proof to be accepted by the court.
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