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"According to karma theory, don't you think I might have deserved everything I got? Might I not have done some evil in a past life which I needed to repay."
No, I would believe your karma was meant to be an example of how powerful a woman could be for your ex-husband to learn from. Karma doesn't not exist in a vacuum. We are all connected, and your karma is meant to have an effect on your surroundings, and our surroundings will also have an effect on our karma. In a past life your ex-husband probably had not learned something from you that he was suppose to, so he came back to you. Lets hope he learned his lesson this time. Do you feel you learned something from him? If not, then you might have to find him again in a next life. The beauty of karma is that it continues to learn for all eternity.
"I have chatted with people who thought everything was karma. I once chatted with a guy who thought that an abused child should not be encouraged to report her abusive mother but rather should let the karma play itself out lest she incur more karma debt."
I would think it would be her daughter's karma to tell the police, so that her mother can learn from her incarceration, and not abuse in the next life.