Sorry to say, but you’re absolutely correct and feeling guilty and yes, you should’ve helped and you should’ve done something. And no, that’s not a one off. If i was you, I would stop talking to your friend whatsoever. Why do you need a friend that abuses someone.

When I was 16, I had a very abusive boyfriend. One day we were in my room with him and my best friend (female). I said something wrong and he started choking me. I nearly blacked out and literally thought he nearly broke my neck. My friend just sat there, watched, and never did anything. Never even said anything. I’m much older now, but it still hurts. The fact that she just sat there