I always say that people don't know what they have until they lose it.
I had quite the same problem, i wanted my depressed ex back and then i gave up and when i did he came after me and tried ( we come back together for two days and he broke up again though). From my experience, take time for yourself and don't expect anything, focus on you and see if he makes changes and try, if not just try elsewhere. Hope everything goes okay though. Take care.