I would try to look at this at how it's benefiting you. Now you have room for the person you really deserve and most of all, deserves you!
It seems every woman has to go through a few dirtbags, a few 'just not the one's' in order to get 'the one'!
Hang in there, it does hurt and it feels rough at times, but post here every time you: feel like calling him, feel like hurting him, feel like crap, feel jealous, feel stepped on, feel used, feel unattractive, feel inferior, etc, you get the drift. We've all been there and here for you. Hugs.