Maybe the reason to call it quits is because you need to work through your trust issues. Once you can get past your past hurts and issues, then try some more self-love. After you can truly love yourself, only then can you love someone else.<br />
Maybe your gut feeling says he is not the right one for you. Stand back and see how it feels....<br />
I suggest professional counseling to get past the trust issues. Honestly, it is so much easier to have help with these things than trying to get through them yourself.
Soo he had an online relationship with two women while in a relationship with you?