My M is a mystery to me. I can think of things we both did right, I can think of things we both did wrong. It is an endless list in both directions. She didn't seem present, I didn't seem present. Overall it felt empty. Neither of us sought out a solution until the very end, when I tried to get her to go to MC with me, and she opted for the OFP instead.
The only other thing I can find, is the codependent/NPD issue, but neither of us qualify as the NPD.