Here's what you do if your girlfriend breaks up with you for reasons that you can't grasp/don't quite understand/won't admit to yourself:
1.) Get over it.
2.) Do not, I repeat, do not "just stay friends". Break it off CLEAN, and when (yes, when) she pulls out the patented female line, "I really like you and want to stay friends", tell her that that's just not how it works. Be polite, but firm.
3.) If she talks to you without you prompting it, keep it civil, but do not respond how you once would have. That ship has sailed.
4.) Most importantly, start thinking about yourself. Think of what you had planned to do before dating her, then go back to doing it.
5.) Find some short-term girls and bang them. Immediately. If you live at home and you're post-college age, make sure they have their own place. If you have your own place... fuck man, you're already halfway there.
It took me a while to figure all of this self-evident shit out, but trust me when I say that you're only lying to yourself if you try and get it back together.
It's funny. I should've broken up with the girl that I tried making amends with within the first six months of the relationship (ended up being two years) - which happens to also be the time that I noticed that I just wasn't that into her, romantically. You might think it's your fault - believe me when I tell you that it isn't. I'm just trying to save you young'ns a lot of trouble. To quote Mohammed Suicmez of Necrophagist in his song, "Ignominious & Pale", "Incarceration of personality is the sad inception of self-denial. The one who denies the inner self flees into deception." Do yourself a favor and stay true to yourself. Don't fear breaking up with your partner. You're doing the two of you a favor.
Anyway, there's some bait for you bored Forumfallers. Have fun.