It is easy to give solutions but truly you would not be able to move on until you want to. It is said, when we get to know other people, invisible strings (in form of enegry) bind us and till you detach yourself mentally and emotionally, it is difficult to move on.
Having said that, the way you can do this, is to realise what happens happens for the good. Keep your self busy with what interests you and gives you happiness. Try expressing your feeling and emotions through art - if you feel like you could read one of my hubs which talks about the same - "Art therapy for the soul".