If you knew your best friend was cheating, would you tell their partner?

Sun_Kim-Ai
If you knew your best friend was cheating, would you tell their partner?

This happened back in November.

My wife came back home very upset. I notice and initially try to prod her, she brushes me off and goes off doing some house stuff. I notice something is wrong, so I keep an eye on her.

After some twenty minutes, she tells me one of her best friend just confided to her that she was cheating on her fiancée and since he was catching wind of it, she was asking my wife to cover for her. My wife obviously wasn't on board with it and said friend was less than thrilled, perstering her with texts that she's not a good friend and most insultingly, if the roles were reversed her friend would have covered for her.

I consoled her for a while and we debated telling the poor guy what had happened, my wife was a bit uncertain but she strongly leaned into informing him. Well, she didn't get the chance because she got a call from said friend and started sobbing and getting angry during it - she put it on speaker and said friend was hurling abuse at her because her fiancée was leaving her - apparently my wife wasn't the only one whom this friend asked to cover from, and someone else had already reached out the guy. I got upset at hearing her vile abuse, so I took the phone and started shouting back at her, getting a good barrage of insults to myself as well.

Long story short, wedding cancelled and said friend dumped and disowned by almost everyone, more for her unhinged behavior than the cheating itself.

She has since reached out to my wife and I to apologize, and seems regretful of her actions, although my wife decided to keep her at arm's lenght because of her verbal abuse at her, insulting me and implying she would and "should" cheat on me.

Updates
3 mo
To answer the question myself, the two times it happened I didn't go and tell their partner, but I encouraged my friend to confess because it wasn't a matter of "if" they'd been found out, but "when".
Plus if they really wanted a slim chance of saving their marriages, coming forward with it could help, or at least rip the bandaid off.

One of them eventually came out with it, grovelled and begged her spouse and apparently he forgave her. Apparently because they didn't divorce, but I don't know
Updates
3 mo
how it's going behind closed doors.

In the other case, they were already separated, and that just sped up the divorce.
If you knew your best friend was cheating, would you tell their partner?
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