Should I tell her that he’s cheating?

My boyfriend has a friend and his friend told him to cheat on me and my crazy boyfriend went along with it and was like okay. His friend told him to lock me out of his phone and tell me he’s going out with the boys when he wants to cheat on me cause it’s not about loyalty it’s about body count. I overheard this conversation and they didn’t know I heard them. My boyfriend went along with his friends advice and cheated on me in the exact steps he told him to do it. I can’t believe how influenced he was by his friend and didn’t think about me or the love I’ve given him at all before making such a decision. Now his friend is married and I am friendly with his wife. Should I tell her the advice her husband gave his friend to do to me? I overheard that he was cheating on her. I want to tell her as a way to get back to my boyfriends friend for giving advice that would ruin my relationship and so his wife doesn’t get an std. I’d just tell her the advice he gave my friend and let her do what she wants with the information. He shouldn’t have gotten involved in someone else’s relationship cause now I wanna get involved in his.