I know the options on the table are accept her for who she is and her relationship and continue living like this, force her to choose between us and run the risk of her resenting me for making her have to change her lifestyle, or for me to leave. Since I'm the one who doesn't want to be a in a poly family, it stands to reason that I should part ways and let her do what she wants. Maybe I missed a few options? I don't want to change her. If she can't give me what I need at this stage in life and we can't reach an agreement that doesn't involve one or both of us being miserable, then divorce is a reality. Along with that divorce involves a custody dispute.
I'm trying in therapy. I don't like therapists. I'm trying to be open minded. I can't say that it's going to help this situation, but I'm giving effort. That's all I can do.