My Boyfriend(20M) found out his friend's (30F) husband (31M) is cheating on her. He doesn't want to tell her and I think she deserves to know. What should I do?

A little background info: my(23F) boyfriend(20M) (I'll call him "Bob") has been good friends with this woman(30F) (I'll call her "Jill") for nearly 2 years now as they used to work together in the past. She has a son and is married (to a man I will call "Joe")(M31) and we all have gone out on numerous outings together. While I'm not nearly as close to her and her family as my boyfriend is, I still consider her a decent friend over an everyday acquaintance.

My boyfriend, Bob, told me a secret. This secret is that he knows that Joe, Jill's husband, has been sleeping around with other woman behind her back. He knows this because the mistress (another old co-worker, whom I also know personally) had told him all about the graphic deatails.

I know all parties involved. My boyfriend told me not to tell a single soul.

So, here I am, going crazy with this information and feeling as though either he needs to tell Jill what's going on or I need to tell her myself. Bob keeps telling me that it's none of my business and she will find out when she is meant to find out. That it will ruin their family and traumatize her son. (Among other things)

My boyfriend gets angry with me anytime I bring it up and tells me that he knew he shouldn't have told me. I told him that I'd want to know if he was sleeping around with someone else behind my back. And he told me that he wouldn't want to know if I was cheating on him.

Which I thought was a little bit of a red flag. I can understand the phrase "ignorance is bliss" but for some reason this entire situation doesn't sit well with me.

Side note 1: this is not the first time he has cheated on her. And yes, she has found out in the past and nearly left him for it.

Side note 2: after his first incident, she apparently hasn't been having sex with her husband all that often. Is this a legitimate excuse to commit adultery? For me and morals: absolutely not.

I'm at a loss of what to do and I'm worried if I say anything to her that my boyfriend would be very angry at me (since he said he would) and I truly believe he would leave me because of it. We have been together for 2 years.

I'm starting to believe it's none of my business and should ignore it, since he says I'm being selfish for wanting to tell her and gets angry (yelling included) anytime i voice my concerns about it.

TL;DR - My boyfriend told me that he found out his friend's husband is cheating on her. He doesn't want to tell her and I think she has a right to know.

Submitted October 23, 2020 at 12:43PM by sunshine2020throw https://ift.tt/34pSnvq