The only way I have found to move on is to move on. I was fortunate and got a new job that helped me some with other things to do. It took me a good six months or more to get over my boyfriend though and involvement with other people before everything was okay.

If I were you, I'd make a big enough change, like a new job or moving, joining a group or taking classes that will keep you occupied enough to not have much time to "hang out" with him.