Most Helpful Guy
What went on in your other relationship has made you paranoid, to keep your eyes out for things that might be going on. That's completely understandable.
Keep telling yourself you are out of that other "relationship", that it is not the same with this guy, and that this guy is tons better than the crap you had before. I'm not saying he won't ever cheat on you, but you have to believe him because if he keeps trying to prove it and you don't accept it, he will stop trying to prove it. You've gotta let his love break you free from the chains that hold you down! ;)
Best of luck to you,