Step it up
@Mac Jesus
tell him the truth and just let him know you're incapable of forming intimate human emotional bonds and don't even feel like faking it anymore, especially when it's more difficult with a child that cries and is annoying and was forced into your life by some frail thin meaningless word "family"
Then let him know your life is better with him not in it and he's a loser and you have your own socks to pull up every day, and to get his shit together, get a few "what are you doing with your life" 's in there