SUBREDDIT: r/relationships
TITLE: Me [18 F] Friend Had Sex With a Guy in a Relationship, I Told The Girlfriend, What Now?
POST: My best friend and I work together. She got a thing for this guy at our work, he's 25 and has a girlfriend. They got in trouble at work for sexting because she's a minor. Later, they had sex. 

I felt really bad for this girl and I sent her a message. The guy messaged me back and started threatening to choke me and a bunch of other stuff. My friend is freaking out and wants to know if I told the girlfriend. She's basically terrified and truthfully, I'm one of like three friends she has.

What do I do? Do I tell her it was me? My other friend offered to take the fall, seeing as how they were involved and don't really give a damn what either of them thinks.
TL;DR: 
I sent the girlfriend a message that her boyfriend cheated and the stuff he did at work. He's mad and the girl he cheated with (my friend) is scared and freaked out.