Dude, I know exactly how you feel. Its gunna suck, no matter what anyone of us say how to fix it.
There wasnt a thing I could do to get my mind of this girl, and I couldnt understand why she left. Everywhere I went, everything I did, all the things I said would remind me of her.
Only thing that could get my mind off her was going out with my friends and trying to meet new girls. As soon as you meet someone new, your whole attitude will change.
Or do what I did....buy a new car
It sucks a lot now man, but get out and things will change.