I am sorry to hear about this. I've been down this road as well and it was the WORST pain I have ever experienced. Keep around your friends and use them as shoulder. Start to treat YOURSELF well again, Doll up, work out, do things.
I know your going to have some low points where you just need to call him. PLEASE DON'T. The result will turn out bad for you because that will just re-enforce to him that you miss him and he will take advantage of that weakness to hurt you more. If he calls you, DON'T even answer. I know its VERY tempting but the end is always bad. This guy REALLY needs to FEEL that you don't need him.
You never mentioned how old you are?
You never mentioned how old you are?