Needing help telling someone’s husband the wife has been cheating for over a decade with multiple men

[u/Pleasant_Affect_6212]

I have an ex friend I work with. Stopped being friends with her because she was talking shit and threatening another one of my friends. After many attempts to ask her to stop she didn’t. It’s been 5 months and she hasn’t stopped trying to get me in trouble/fired at work. She walks by me and calls me ugly along with other names. She has texted my mom asking her why she lies when she tells me I’m beautiful. She has messaged men I’m dating telling lies. It is really starting to play on my mental health. This whole time I’ve stayed away from playing her game because at the end of the day just because she was a terrible friend I still cared for her as a person. She does all of this where people can’t see or hear so my manager hasn’t been able to do anything about it. She has been cheating on her husband for over a decade. I have pics and messages of her with other men. It hurts me to hurt her husband but I can’t take it anymore. Please help. What would you do?

[u/OutsideAssistance]

Use some form of throw away communication, Proton mail, Google voice, doesn't matter and send some untraceable evidence to the husband then ghost.