Recently I unexpectedly came into contact with a girl who is currently dating my ex-fiance. I'm the one who contacted her, but I had no clue who she was at the time... totally inadvertent. ETA: We're not friends, I don't know anything about her but her name. This was a random internet thing. She is over 3000 miles away.
He is a troubled guy - drug addict, compulsive liar, and abusive. After we broke up, he married a woman who divorced him when he nearly killed her.
She is understandably hostile toward me, and I know that any contact from me will probably seem like meddling, stalking, or an attempt to steal her man. However, given that he seems to be even more dangerous now than when we dated, I feel like I am ethically obligated to warn her that he is abusive. I figure even if she doesn't listen now, someday he may do something to scare her and she'll remember.
I have asked his other exes and my friends, and we can't come up with a consensus. Help me, TQC!
There is of course a long, dramatic back story full of fail on all sides (including mine). If you need more info, I will answer questions in the comments. I especially appreciate input from anyone who's been in a situation remotely like this.