Once again I am going to tell you to protect yourself, Will. Maybe you misinterpret what we mean by protecting yourself. Let me put it another way. Do what is best for you, even if she doesn't like it. All I've seen is a man who chooses to continue suffering emotionally/mentally at the hands of his WW. I am saying you need to stop taking this sh't and do what is best for Will.
I think she disrespects you so much that the relationship needs physical space. If you live apart from her, maybe you can go forward and find happiness.
I think it was your first thread where you said, "I just can't do it". You were referring, I suppose, to the advice you had received. So, my suggestion is to start doing whatever you want to do. The MR is not working and continues to get worse, and you feel you cannot enforce boundaries.....so what is left?
It breaks my heart to see people staying in such unhappy situations. You do NOT have to continue being walked on day after day. That is what your W does every time she makes you look stupid and blames stupid things on you. It's b/c she no longer feels respect for you as a man. Do you understand what I am saying about her? Her feelings will not change under the current circumstances.
You have only focused on her affair with OM. She would need to end her affair....but let me add something else. The affair is not what killed the MR. Her disrespectful feelings toward you is what killed the MR. She is wayward. She wants to have inappropriate "friendships" with other men. She doesn't care how it makes you feel.
If you cannot make changes in the man you are currently, then IMHO, the only healthy option left is to separate from her and make a better/happier life for yourself.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!