You don't need a lawyer. Ignore him. Don't jump through any hoops, don't do squat. Just ignore him and move along.
this is the best advice you've gotten or are liable to get.
I have had a certain amount of experience with my wife's ex husband. He's a manipulator like this guy seems to be. Took me a while to teach my wife how to bitch slap him every time he tried to pull some shcit, but he keeps a pretty low profile now.