I am definitely not one to keep my mouth shut, especially now. I told my former Mrs. (not to mention her mother, too) in no uncertain terms what I thought about her and OM. We still do many things as a family. The problem was that I waited too long to confront situations that I didn't like. Communication is the key.
Humor me here. I do believe that if tree were to say. "ok, fellow, I am tired of your nonsense, you can leave," see how fast he comes around and drops his nonsense. Another and perhaps less threatening method is to ask him why he is unhappy with his life. Tree is a great woman. Any man should be happy to have a woman like her. This whole situation has never made much sense to me.