My friend is dating my ex, what should I do?

I think I'm similar to Rueuwu in some ways. I think I'd be okay with a friend dating the ex I had who was overall a nice dude but we were in different places, and it wasn't going to work. But I've had formerly close friends who dated my abusive, rapist, and narcissist exes and knew about what they'd done to me, and that's a betrayal I wasn't able to accept. I wished them well aloud, warned my friend about what was to come, and never talked to them again. I have a mixture of bitterness at losing a friend and pity that the ex found another victim. I'm sorry you're in this situation. It's never a fun place to be. I hope you can take care of yourself while you're working through all of it.

My own personal values disagree with dating friends ex’s. I don’t want to share the same dick my friends have had it feels weird and wrong. If my ex hurt me I would feel betrayed for my friends to befriend them let alone date. It depends on your own values if you’re okay with it personally then it’s fine but if you’re not okay with it you should tell/drop her.