You're in a hard predicament.

I can relate to you. I think you want to keep peace because you're no longer interested in drama. I, too, wonder, why your ex still wants to keep in touch even though he treated you badly. But I am in a very similar situation to yours. I've been told things that I would never think to say to my partner, yet my partner has said awful things to me.

I wish I knew the answer. If available to you, I would seek professional help from a disinterested party. But know, too, that counselors are people and you may like some more than others.

I downloaded an app through my health care plan. It's better than nothing. But does not meet the mark.