I know its been posted many times but Ill give you my 2 cents worth as well.
DO NOT STOP JUICING. If there is one way to get through a breakup its exercise and being active. Beside that, the best revenge for a breakup is to better yourself. Better your strength, better your body, etc. You are in the middle of a cycle so its the best time to build yourself. Get some new nice clothes, all of that sort of thing. Lets say you run into her a few months down the line....whats better than being hella cut, looking nice and being confident?
Another thing, they are all right about not talking to her. Nothing extends the pain of a breakup like talking to the girl....yes, easier said than done but it is the best way. Ignore her phone calls, ignore her emails, take her off your buddy list on IM if you use it.
I have been there before...the feeling that she is the ONE for you, you gave her EVERYTHING, how can this be happening? What did you do wrong? Maybe if you change things it can be different? Just one more chance for everything to workout! <---- FORGET ALL OF THAT. You gave her everything, she didnt reciprocate, there is nothing you can do, its HER loss. F*** her, you are better than her. You dont need to be jerked around, you are better than that.
Ive not been on these boards long, but Ive read your posts, you are an intelligent guy. You'll get through it and be better for it....and eventually you'll find a girl that you like even more than her and she will treat you like a king.