No matter what you do about reporting B, please, please, please, make it very clear to him that you want nothing more to do with him. And then stick to it.
This broken wrist should make it very clear that B wants nothing good for you. Next time it could be worse. Get him out of your life before its too late.
"I get up, and nothing gets me down.
You got it tough. I've seen the toughest around.
And I know, baby, just how you feel.
You've got to roll with the punches to get to what's real"Van Halen