Need Advice Please!(Very Long)

My girlfriend of 11 months recently broke up with me. We have had problems in the past but always managed to stay together. We have actually known each other for 13 years and dated around 6 years ago. Back then we only dated for a few months and I broke it off with her to get back with another ex. Her ex dumped her a year ago and we started seeing each other. He wasnt a very nice guy and cheated and lied to her all the time. Finally he made anohter girl pregnant and she ended it with him. She cheated on him with me by the way on new years 2k. Anyways Ive always loved her and I always will. We were always pretty good friends and kept in contact over a period of 13 years. When we started dating again she seemed like a different person sexually (from prior experiances) She seemed like she didnt really enjoy sex. And she would never touch me. I initiated 95% of the time. Everything was fine between us untill she started working at a new resturante and became friends with other waiters there. She started wanting to go out drinking with them all the time. Im not a real big drinker so I declined her offers to go out with them. She also started using marijuana much more frequently (although she always did smoke it) We had a few arguments about sex, and one argumeent about her lying to me becasue she flashed one of my friends on my webcam then said she didnt do it. I would get mad if she rejected me and say hatefull things sometimes ( I felt as if she was cheating on me or didnt want me anymore) and she became very distant and said I treated her like a peice of meat. I acted like a fool and drove by one of her male friends house at 2 am one night and she was there drinking with him and a few other people. I caused a big scene and she accused me of stalking her and broke up with me. Now she thinks Im a obbsessed stalker. Weve been broken up for over a week now and she calls me once every other day wanting to talk. I end up telling her how much I love her and want her back and then we start fighting over the phone arguing about everything that has happened. The past few times weve spoken have been over two hours each phone call. This is really starting to get to me and I do love her very much. I want to work things out with her although I feel like she was always on the recieving end of this relationship. I did so much for her and loaned her large sums of money when she needed it. Also bought things for heer all the time just so she would know how special she was to me. All I know is that I want her back in my life very badly and I love her very much. How do I go about getting things straight with her? Any advice would be appriciated. Tweet