I HAD to interrupt and say drop her non. Let her go off and mess up her life. You deserve to be treated with respect and dignity! Realize the fraud she is and how much better you can do!! I hate to see nice guys treated so badly!
Trust me......a guy friend of mine broke up with a girl who then got involved with a guy very similar to whom you were describing. She wound up penniless, on drugs, and in the street alone because she had turned on every single person that loved her.
All that to say let bygons be bygons, let her be a jerk about everything. But realize you are worthy of a woman who knows how to treat you when you are together or "just friends."
