Don't put all the guilt on yourself. If he wasn't having those thoughts while being married then it wouldn't have happened. He is the one who cheated. Does his wife know?

I agree to stop seeing him completely. If you have feelings for a man who has cheated on his wife, do you think he would do the same to you? I always hate it when I see this happen to people I know. They have slept with someone who has a significant other and believe that they will actually end up together. Either they will work things out with their significant other or, if they do leave, they will only cheat again.

My dad cheated on my step-mom with a woman who was also cheating on her husband. They are married now and he is extremely unhappy. The entire family hates this woman, not just because she went after my dad, but just because she is an unhappy person. I wouldn't be surprised if my dad is cheating on her or the other way around already.

I hope you make the best decision for yourself. Think of your own mental health first....and physical. I was cheated on by my ex and, after a couple years, found out he had been having unprotected sex with this girl and lied to me about his "number" when we first got together and ended up having the most frightening week of my life waiting on test results to come back.

Just try to forgive yourself and move on. I know that's a lot easier said than done but we are here for support!