Is there anyway to be around him in some sort of social gathering (one where he can see you happy & interacting with others, but not "with him as a couple"?) So he can see for himself the changes without feeling he's being "played" to try to get him back? You know, kinda flaunt yourself around just a little so he knows it's for real & you're not just playing games or anything. He may not believe your "words", but if he sees it for himself it may make a difference.