Gm, im sorry the situation didn't work out. I think you can use all his negative energy for your gain for the time being.......
SCREW HIM....
He'll continue to play out his little fantasy, and someday its gonna knock him upside his head with the ugly stick. My mom was divorced 3x, all 3 times, they came back begging within a year or so, but my mom moved on. Her first husband even tried after she divorced my day 14 years later. They think its a gain, but that's cause they haven't seen what they've lost yet. Time is the only cure. Just wait, he didn't fix anything, so he's dragging it over with him. Its not your problem now.
I think its time for you do dust off the dancing shoes, and go have some fun. Splurge on a new outfit. Get some of the girls from work out for a night of fun. You are no longer bound by rules that only you were following.