If you haven't already then I'd say read Neil Strauss, The Game, its a great book which will make you laugh and also help you to see light at the end of the tunnel

You gf sounds like my ex, and I was in exactly your position just without this forum, I think if I had put my sub consious thoughts onto a forum such as this maybe I would still be with her (although I have no regrets) in my expereince all you need to do is play hard to get, and by getting your social life back in order and taking up hobbies this will happen as you won't always be free to be with her, making her desire to see you grow and seem less of a chore, remember... Absence makes the heart grow fonder, also I know she is your girl friend but light hearted negs will work a treat, through txts and normal day to day interaction, make sure there fun light hearted negs!! Girl friends can become extremly offended and unlike in the field you can't just walk away, you have to stay and deal with it!

Hope things work out for you, sounds like you really like this girl