<human>: Provide a brief overview of the text.

I've know this guy for about 5 years now, and we dated off and on for 2 so far. Basically we started as a hook-up and the fuck buddies and I was kind of immature at the beginning so I would leave when I got antsy and then realize I wanted him. He's a great guy who has put up with my shit and made me a better person, he's my boyfriend and best friend.

So the problem is, we broke up january of last year and he dated another girl (who was horrible and very wrong for him) and I ended up in a rebound situation with another guy on the rebound (which was perfect). My then-ex took a "break" from his new girl after a short time, in which we hooked up. The problem was, when the "break" was over and he got back with her, he and I didn't stop seeing each other. It was a bad situation and I straightened myself out and then encouraged him to break up with this horrible girl (he always talked about how much he hated her).

Well anyway, he was great at hiding the cheating from her. She never suspected, and won't ever know. The problem is, I get a little anxiety now about him and his phone. 

I hate when he uses it all the time when he's with me. We are otherwise very happy and he has been working hard at not being on his phone all the time. But I've started to think that it's not because of me, it's because he's hiding something. I want to, and I do trust him with everything, but I'm scared that if he hid cheating so well once before, it would be easy to hide cheating from me.

Idk I guess I just needed to get this out, he feels terrible that what he did in the past still hurts me, so I don't like to bring it up a lot.
<bot>: I know I don't have a good reason to be skeptical, but is there a good way to get over this or is it just something that every time I get anxiety, just talking myself down?