To start I’m going to say I have 3 friends. Friend A Friend B Friend M. Friend a and b are both girls friend M is a guy. Well Friend A is single. Friend B is married and friend M is single. Friend A has always told me that she has always had a strong desire to be with M but made me promise to not say anything because she feels like if he felt the same way it would have been obvious. I kept my word and all these years we have known each other I haven’t said anything. Recently I found out from a somebody not mentioned that friend M has been having sex with friend B and they have started some what of a fuck buddies relationship for the past 4 months. So B is married and I know her husband doesn’t know. But I know M knows B is married and neither of them care. Since I found out I brought it up with B and told her she should just end things with M or get a divorce because what she is doing is wrong. She refuses to listen to me so I’ve gotten to the point I have her and M number blocked in my phone and haven’t talked to either since we have started the New year. Friend A is still hanging out with friend b but doesn’t know that b and m are ducking each other. I feel like if Friend A knew what was going on she would be crushed but would def stop hanging out with them. Should I tell Friend A what’s going on? she’s been to the movies with them recently and acknowledged they seemed flirty with each other (she is already dealing with depression so I’m careful for this reason about telling her). Should I tell B’s husband? I don’t know what to do. My husband told me to stay out of it but I don’t know. I mean I’d want to know if I was being cheated on. Wouldn’t you?