Hey, I was in a fairly similar situation with my ex, well, no, let me put that differently, I got on like best friends with my ex too, we split up about 3 weeks ago, it was amiable, but, after reading enough YAGT's on ATOT, I knew what was necessary. I said to her that, at least for now, I wouldn't be able to speak to her at all, as it'd just make it harder for me, so we agreed not to speak at all, and we'll see how it goes like that. Once I'm over her (i.e screwing other people) then fine, I might be ok to talk to her and so on, but until then, just get out of my life basically.
You are being pathetic, you're chasing after her, making her feel wanted etc and just hurting yourself. Best thing you can do is just forget about her, get out with your friends, keep busy and just realise that life is about yourself, ignore her and enjoy yourself. As everyone always says, it'll get better with time, and it will. Even if you still want to get back with her, she's FAR more likely to be interested in you if you appear to be getting on fine without her, being a generally cool guy and seeing other people/uninterested in her. If you continue being this lame puppy dog best friend BS, you will continue to get nowhere and just cause yourself more pain.
Forget her. Get everything about her out of your life. You can tell her the reasons if you want to be reasonable etc, but just be mannish, don't speak to her, ignore her texts/calls/glances, everything. Far as you're concerned, she should be dead.
It's the best way mate, honest. Oh, and :beer: it up
That OP is a sure way to get abused on ATOT. You just lost your man card.
EDIT: Speeeeling/Grammar/removing drunkenness.