How do I move on with my life?

I was seeing this guy about a little over a year ago, we called it quits do to certain things. We have remained friends and still talk to each other. He has a new gf whom he has been dating for a long time now. I feel like I can't seem to ge over him!! It has been long enough and i feel like I am never going to move on with my life. I still care about him and love him and him being with someone else doesn't help matters any. I find myself still being sad abut him and thinking about him all the time. I want to move on and get on with my life, but can't seem to do it?? Any ideas of how?