Right now he's probably having to face his own problems, you are working on yourself, so he doesn't have you to blame everything on anymore.
Keep working on you, for you. You may have to put him on selective mute for a bit, but let him know that you find his words to be sabotaging to your process and you don't appreciate it.
If he's going to act like a kid talk to him like one. "If you can't say anything nice don't say it at all".