Ex troubles...

So back in April I started hanging out with a group of friends and there was one guy (A).

A, and I started talking and ended up dating. We only dated for a month and half. He never wanted to label what we were, he never posted about me, only a few of his friends knew about me (just the group we hung out with). I can say now that I think I was close to loving him. I was told by everyone even outside sources, not to date him because he had a reputation. But I didn’t listen to anyone because I really really liked him. We hung out constantly went to the same college, etc. we broke up after a month and half of dating because I realized he didn’t want a real relationship. I got the courage to end things with him because I couldn’t handle his ex still snooping around in his life, stalking me, etc. I never wanted to end things. It’s been 6 months since we broke up and I haven’t seen him since (except on friends Snapchat stories). Recently he’s been back in my head. It absolutely crushed me when I had to break up with him for my own good. I was so hurt for so long and still am. Recently I’ve been thing about him a lot and I don’t know how to feel. I’m extremely hurt but I still wonder what could’ve been. I still wonder how he’s doing, I miss the feeling I had when we were together (I felt like I was on top of the world). I miss that feeling so much and I miss him more than anyone right now. And I just don’t know what to do...

I even dated someone else for a while and it didn’t work out because im still hung up on A.