Keep in mind that even living together with someone before marriage (if you possibly did) does not give you an accurate picture of what the person is truly like. Please don't blame yourself for getting into a relationship like this one. Yes, it could be something about you that led you to be attracted to her, but at least now you recognize it's not a healthy relationship.

How about talking to a counselor about the situation? I honestly don't believe God expects us to stay in an abusive relationship with someone who won't change. Frankly, she seems to be doing you a favor by moving on, although I'm sure it hurts. It sounds like you gave it every chance.

BTW, my mother has narcissitic personality disorder--and my father was very passive. It was very sad watching how she emotionally abused this dear man.