For my current wife cheating wasn't an issue because before we got married we both agreed that there would be times when we fuck other people, Now with my ex-wife it was another story,
My ex-wife started running off on me about 4 years after we were married, during our whole marriage she did this 4 times and I would always go looking for her and try to bring her back, I never caught her with someone but it was obvious what she was doing and years later after we were divorced I found out from some of her friends that she was fucking other guys,
Funny thing though she caught me with her best friend the last time she ran off, she left on a Wednesday and came back Saturday morning wanting more of her clothes, when she came in the front door she saw her best friend walking around in just one of my T-shirts, it was very obvious what we had been doing since Friday.