Dear Sugar,
A couple months ago I got a friend request from someone on Facebook. I ignored it because I didn't know who it was, but she kept messaging me, pretending to know me. My curiosity got the best of me so I responded, asking who she was. She said that we had never met, but that she is currently dating one of my exes and she wanted to get some information on him.
My ex and I are no longer in contact — things ended very badly after he repeatedly cheated on me. Part of me wants to warn this girl, but the other part of me doesn't want to even talk about him anymore. What should I do? — Wavering Whitney

To see DearSugar's answer, .
Dear Wavering Whitney,
It sounds like you still carry some hurt feelings about the breakup, so while divulging information about him is completely up to you, I advise you to weigh the pros and cons before getting involved in his life again. The notion of warning this girl might seem heuristic, but I'm a big advocate of allowing people to make their own judgments; I'm sure you'd want the same autonomy. Yes, he was a jerk to you, but that isn't to say that he'll be a jerk to the next girl; then again, he might — it's a total crapshoot.
At the end of the day, the decision is yours and I wish you luck in whatever choice you make.
Source [1]