Sweetheart, I've done told ya.....once a mamma's boy, always a mamma's boy. That is your problem. No matter what else he may or may not be doing (and you are still trying to find something else)he's still a mamma's boy. He chooses his mother over his own wife! That's not normal. I have never seen a true mamma's boy change. I think you need to move forward for your own sake. If anything was to ever nudge him to save his R with you, that would be it.
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!