I just have a burning thought/question... is he in a sane mindset and is just over this M? That he is rational, not in an A whether it be PA/EA and this is truly just what he wants which is why he thinks we can be friendly
This is impression management. He knows what his behavior looks like so if he can get you to play along the narrative will look like "we grew apart" not "I'm a massive a$$ who walked out on a postpartum wife and three small children."
Also possibly testing to see how much of his cushy life (boats, etc.) he gets to keep and how much he loses. My ex suggested he tag along to my family's annual beach trip and share a room with my younger brother (single at the time), just because he liked the trip.
Remember, NONE of this is about you.
Me42, H40 D12, S8, S7 A revealed: 7/13 Sep 4/14; Agreed to D 1/15