She seems to really resisting filing for D, even though two months ago she said that was what she wanted. It seems like she doesn't necessarily want D, she wants to live under separate roofs but still have the same life otherwise: same house, living same life with kids, not working full time, but with me out of house.
Bingo!
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!