Sounds like she's not ready for a relationship - - maybe on the rebound or she quits when things get too tough. Whatever her issues are, you can't fix. It's always hurts me to hear how people can invest so much into a relationship, then go trash it so quickly. I hope that part of you never changes - - your loyalty and willingness to commit to another person. Also, I hope you don't pick up any of her bad habits. Make a dart-board with her picture on it . . . just kidding.