My ex-husband just got engaged 3 months after our divorce.?

The thing is, she doesn't know a lot about him, he's an alcoholic, involved in multiple adultery incidents, was physically abusive to me, (he has been charged, but we made a monetary deal in our divorce so he wouldn't loose his job.) he's alienated from his children. He has told her none of this. Is it my job to tell her? She's never met his kid's, seems like that should send up some red flags for her, but my ex just tells her they're not ready. My friends and family tell me not to say a word to her, my ex will just make me out to be the "crazy ex-wife," and she needs to find out on her own.