What do I do with my ex girlfriend?! please help?

You mustn't go with her, she finished it with you, therefore you are not being available to her whenever she feels like having you around, it's hard but you must move on, find someone else to go with and have a great time ! You sound like a great guy, get out there and meet new people , life is about change, it's not what happens to us that matters, it's how we deal with it.