Do others thing, make yourself busy. Divert your attention to others thing like work hard, date a new girl, drinks with some friends, talk to friends and family, and don't stay alone. Faster way is dating a new girls, can try get a new girl from sugarbook or others apps too.

There is no formula for this kind of things, you can try make yourself busy, do others thing to distract your attention. Exp: busy of working, do some outdoor activities, exersice, listen music, watching movie, hang out with friends etc. After a short time period, can try date another girl. Times will cure you.