I went through this with my ex-boyfriend for over a year while dating my current beau. Get rid of the guy if he's no good for you. It's not worth your time. It can ruin current relationships and future relationships. Clinging onto the ex never helps, unless he truly is worth the clinging. In my case, my ex was not worth and is still not worth it. This is a BPD thing that I think many of us suffer through. It's the whole "I hate you, don't leave me" complex.