If he asked me how I was doing I'd probably say well that's not your concern anymore, right? Obviously he wanted out so that's part of it IMO. He was just temp checking you. If it feels like a temp check, just politely avoid playing into it. He obviously wasn't there to share anything with you to make you feel better.
I agree with your last paragraph.
H 34 W 29 BD 3/12/18 Divorce Busted Spring 19
It is not things that bother us, but the stories we tell ourselves about things.