The new guy your best friend is seeing has rubbed you the wrong way from day one. You’ve always been nice to him, but you get a very sketchy and somewhat controlling vibe from him.
Most recently you witnessed some strange scenes between him and your friend where it seems he’s intentionally putting her down in a condescending manner. She’s taken to isolating herself, and you think there may be some emotional abuse [1] going on. While it's technically none of your business, you don't want your friend to get hurt so how would you handle this?
Source [2]