Everybody has endured the bizarre and awkward experience of a friend, who is usually amazing, being really mean to her boo. I don’t just mean once or twice after an argument, but consistently. If you didn’t know any better, you’d be pretty certain she hated her boyfriend. You’re not quite sure why she’s with him. He certainly doesn’t bring out the best in her—she’s usually so sweet and positive! So what do you do? It’s an odd turn of the tables because, usually, you’re telling your friends that their partners aren’t nice enough to them, not the other way around! But you can’t just sit in silence as your friend verbally assaults her man. Here is what to do (and what not to do) when your friend is a nasty girlfriend.