The process of getting over someone special has several steps.
At the beginning, when all you can feel is just sadness, loneliness, shock, etc., what you need to do is distract yourself. I know lots of things would remind you of that person, especially if you were together for a long time, but you also have a lot of memories with your friends and family. Also read a book, watch movies or TV shows, play sports, listen to music, etc. Distracting yourself helps numb the pain when that is all you can feel.
Then later, you will be able to start thinking sensibly and look back with retrospect, without being clouded by emotions.
Aw I'm sorry sweetheart. This is a touchy subj/situation.
Maybe you can just get yourself involved in enough side activities to keep your mind off things, like build a car, go to a gym, art class, dance class, (hip hop will keep you bussssy) get a job, study for school, hang out with pals a lot more, whatever to keep your mind distracted, and before you know it, you will think about her less and less...
Nobody is perfect and chances are there's a better girl out there for you hun, you're obviously really sensitive. This sounds pretty awful but it's not; you need to start talking to a lot other girls and maybe you'll build an attraction to them. Also find ways to express how you feel like through writing or art which sounds tacky but it helps a whole lot.
Keep youself occupied with other things. The less time you give your brain to think about the breakup and the great times you had with this girl, the less time you will have to be upset and depressed about about it. I don't mean it to sound like there is anything wrong with remembering the good times you had, but not until you are ready. Keep your head up man, it will get easier with time.
i think you need to get yourself back out there don't give yourself time to mope. start developing other relationships and if you guys broke up that means you were not right for each other so find somone who is better. also hang out with the boys a lot and just do guy stuff like pool in on a ufc or watch the game togther I find it helps as a masculin guy.