still not over him

I dated this guy for a year. when I met him I knew I had to have him . we were taking things slowly and I started falling for him but when I asked him if feelings were mutual he told me that he wasn't looking for anything serious. even though that hurt my feelings, I continued to stick around. we did things like couples but we were never a "us". in the middle of our fling, he started talking to someone else, even having sex with her. of course that angered me and i found out from her telling me. i did not leave him, but i made it clear that i was hurt. after that, we established an understanding that we wouldn't disrespect each other. gain, he's doing what he wants. so I did what I wanted. then, we constantly argued. during an argument he told me that he loved me. a couple months later, he left me and told me that he doesn't feel like he's leading me on the right path. I tried reaching out to him but he doesn't really talk to me. he has a girlfriend now and I want him back no matter the problems we've had. i feel depressed at times. we recently had relations once and after that it went back to the same antisocial him. i really just want him to give us another chance. I try to gain peace from relationships with others but i never feel the same as i do about him. there were times i felt that he is the one for me . i have dreams about him all the time, bad and good. i dont know how to let him go and i really just want him back. even though we practically ruined an "us", we had really great times.