Im sure he loves me but.....

I recently reconnected with an old “friend”. We were in the same circle of friends about 9 years ago and we messed around here and there. During that time I really liked him a lot, however nothing ever came of it. We both ended up meeting other people and getting into serious relationships with them. Well ,we ran into eachohter again about 1 year ago and have recently became very serious. My problem is, I believe there are feelings he’s still harboring for that girl he was with when we lost touch. He loves me and I know that, and he treats me better than I have ever been treated and I couldn’t ask for anything more. We did have some issued when we first met up again where he acted like he wanted to settle down, but still tried to meet someone from the internet ( I caught him) so there is a slight issue of trust in my mind, and I”m embarrased to say I snooped arond on his cell phone and his ex-girlfriend has a rigntone about a man loving and missing a woman and being foolish for letting her go blah blah blah. I don’t think he’s cheating, but it still hurts so bad to think I’m just the filler for some he really wants but can’t have. Am I over reacting, should I talk to him about this and tell him I snooped, I’m not sure what to do with these feelings.