Honey - no new relationship with him!!!!!! If he was CAPABLE of turning into the guy you wanted him to be, he would have done so by now. You are missing your FANTASY of who you thought he COULD be, but you won't miss the reality of who he IS.
You deserve BETTER - a nice functional guy with a work ethic and who thinks the sun rises and sets on you. Don't settle for less. And use the free time that you used to spend worrying about him, to make yourself into the kind of person who will attract those great guys.
And get out a piece of posterboard, cut out some pictures of what you want to attract into your life, put it up in your kitchen. Time to dream BIG and happy
Ellie
(P.S. YOu know, of course, that you are not so much feeling down about HIM, but down because he was your buffer against the feelings of rejection from your H? Don't confuse the two, and work through the stuff that needs to be worked through.)