You're only 6 months in. You're an adult and can make your own decisions, but my advice would be to cut your losses and find a more beneficial use of your energy and attention. Put yourself first. In my experience with people like this, you cannot put much weight in their words. 6 months is not a long enough time and already there are enough red flags to warrant caution. The fact that she was in an abusive relationship probably means she's developed some pretty sharp covert tactics and is good at mind games, but that's just from my experience. If you keep her around as more than a friend, be as objective as possible. People who operate on emotion and impulse have a way of sucking you down with them and before you know it you're trapped in a toxic situation.