I'm not going to continue to help my ex through his abusiveness.
Might continuing to help him in the midst of his abusiveness be a good idea?
No, I don't want to be a pawn in his world
You should be there for your ex. He's having a hard time. You should help him out.
He doesn't deserve the help.
Okay. Ultimately, how you respond (or don't respond) to his pleas for help is your choice and it's alright for you to withdraw your support so that you can do what is right for you. However, if you can find it within you, it would be good for you to support him and encourage him to get professional help.