Ex Girl Friend

Just forget about her. you need to move on man. come on you can do it! =]]

As advice I say it won't help you to keep this bottled up, so you have to tell her how you feel. This time if you get back together make sure to give the relationship a chance before callin' it quits.Couples have their problems, and it's a good thing that's how you know you care for one another.

It takes a while to get over someone, and at times, even more especially when you were the one quitting. If you were not too sure about it then, the decision might be hounding you now. One moment you might be like I am strong, I can do this, while at another, you feel so lonely and start thinking about her. I guess I would first decide what you really wanna do. Forget about those moments where your feelings are skewed to one end but focus on what you want to do, in general, with your life, when where how.. and then see how she fits in there or not at that calm moment if you can decide what you wanna do with her, that'd be the best call you can make.
If you decide to call her, then like marisa says above, you first need a phone number or something. and then just call her and be genuine about it. don't go to extremes. Also keep in mind that she might have a new boyfriend now and might not wanna talk to you at all. so beware of any possibility you can come across.
If you decide not to call her, then remove everything that reminds you of her from your life. pictures, clothing, gifts, letter, emails anything. then each time you seem to remember her and get into thoughts, close your eyes, take a deep breath and count to ten and forget about it. At first it will be difficult to do but you will manage to do it. And if you ever fall into those trap moments where you feel like you can't do without her, remind yourself again why you took the decision you took. Good luck.