He just couldn't stay and be miserable any longer. He often thinks about what we could do to get back together but he doesn't see a way. Our relationship was broken.
So is he still miserable or did getting divorced magically cure him?
My guess he is still miserable and you didnt break him and can not FIX him.
Best to let him go and FIX himself cause you can't nake a new relationship from two broken people.