I was in a similar situation too I think. Except I started a relationship with a girl who did break up with her boyfriend but she still loved him, and before they had broken up she wanted to propose to him. After a week of me and her going out, the boyfriend wanted to get back together, so she did. Another week or so passes and she breaks up with him again. She's going out with some other guy now, and needless to say it isn't me. I mean, I deffinetely know I'm a better boyfriend. I'm smart, funny, good looking, honest, thoughtful, cute, sweet, and just about every good quality a person can have really. I think I might be as close to a perfect boyfriend as you can get. At least, that's what I had to tell myself to stop me from crying myself to sleep every night for three weeks.