The main thing in marriage is understanding. If the parties involved know thou marriage is an institution founded on by God and sustained with love , them that goes a long way towards answering the question.
If i truely love my wife and cherish my marriage then i will guide against anything that would destroy it. So if that is the case and my wife cheats on me,
1. I will isolate myself from that environment cos i'm a man anything can happen,
2. Try as much as possible not to talk about it when we eventually meet at least for some weeks.
3. Pray for the grace to forgive her cos she is my 'wife'not my girl friend.
4. At the right time i will to to her as a husband. I hope that will take care of the situation.
5. Though it is not easy to do but with God and the right mind set it's possible,
NB. Avoid discussing your family problems with every person and mind the line of things you listen to.