Right, right and right. Yes, he wants to come off nice now that the D and SA is under way. Yes, you probably stepped on his ego.
Yes, he has had to acknowledge that you didn't 'need' him to get along. Should you trust any of this as honest and caring? Not a chance. It's not as if he didn't know someone was paying the utility bills the last year and a half. The utility fairy??

IMO, change the bills over to your name pronto, and if he wants to contribute, he can do so by court order of a designated sum. Perhaps you can use this to your advantage to show that he can contribute to the household expenses when he chooses too. I know I sound like a hard-a$$, but be wary. If he discovers that this is not going to change your stance on the settlement in any way, you'll see Dr. Jekyll change into Hyde right before your eyes.