I can't get over a break up.

So my boyfriend of a year and a half has done somethings in the past which made me lose my trust in him. We are open to each other so I know a password to one of his social media accounts. He has recently moved far enough away so he is out of the school district. I love him I really do. I'm not sure if this is bad but I sometimes check his account just to see if he's talks to anyone questionable. I saw he had been talking to a girl and we ended up fighting. We had been drifting apart. I ended things about 3 weeks ago. I tried my hardest to get over him but I can't. We were so close and sometimes I regret it. But I know it was best. I can't have him talking to other girls seeming as we had a mild situation like this before. We talked today and he seems to be moving on which hurts and makes me want to date him even more. I still love him. Is that bad? Is there anyway I can try to get over him?