I’m where you are. I had so much anger, hate and resented her. I wasn’t married to her but I would have done anything for her and her kids and I did she cheated a number of times as well as lord and manipulated me and others.
I still say if someone cheats and risk losing you, they never love nor valued or respected you as a person. My problem was I stayed to long and showed what I would put up with.
It’s awful and I feel it in your story.
I hope you find someone one day that loves and respects you how you deserve.