Stuck

Katherine
So my boyfriends brothers girlfriend, is cheating on him, I know this because she's actually a really close friend of mine, and she tells me about it. And I don't agree with her at all because he's like family he's my boyfriend brother like how am I gonna actually agree with her, but at the same time I can't tell him that's she's cheating because then I'll be stuck in the middle and I really don't want to lose my friendship with her. But I can't take hiding this anymore either. Even though I asked to never talk to me about it again. I still know what she's doing, and I have no idea what to do 😔😔