Confused😞😞😞😞

So in the past I've had a guy that lives all the way in Las Vegas. Me and him had a thing for a while but then it stopped after he completely abandoned me and didn't say sorry or anything. So I sent him a really bad message about him doing that to me and he read it but didn't text back so I was hoping that he would get all upset and regret what he did to me. Me and my current boyfriend were broken up at the time and after all that shit happened I decided it would be better if we got back together and we've been together for 2 years now. But now I keep having these flashbacks about the other guy and it makes me think that I'm happy now but what if I was with him? Like how would things be? And he keeps liking my Instagram pictures and watching my snapchats and it just makes these flashbacks worse... Someone help me please?!?!! Idk what to do🙁😓😞😞😞😞