His feelings weren’t deep enough for me, he thought I would be better off with someone who truly appreciated me, maybe he just needed a lot of attention and it was more than I could give (that was a new one for me – I’d never heard that before and I was pretty darn doting in our relationship); maybe we had just started leading separate lives (?????)???
I don't think what he's saying is as uncommon as you'd think. Part of it may come from guilt and the rest of it is just the pure craziness of his walk-away or MLC condition.
I still believe he's being scammed, and OW may continue putting off moving in with him. Has he told you how much he's already invested by giving her money or preparing a new place for her?
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!