Hi David

Good luck with the therapist. Your post already has the answer. Cut contact with your ex. Do you have kids with her? Otherwise there is no reason for you to stay in touch.

How will your ex destroy your life unless you let her? Get away from her and look forward instead of backward.

You may not be a good person, i am pretty sure I am also bad to some people and good to others. If you committed an actual crime, you deserve punishment via the legal system of your country. In no scenario, does one individual get to destroy another person. And in this case, you need to take control and move on.

I am glad you made a choice to live a happier life. You need to work on that actively and reframe your future in terms of things you can control and act on. Good luck!