Would you tell someone if they were being cheated on?

Me and my best friend know this lad we used to be friends with is cheating on his fiance with another girl we used to be friends with.

Both are shitty people but we also work with these people and I'm still friends with the lads mum and I'm still civil with him too. I just hate the girl involved she's the whole reason everyone has fallen our with each other.

His fiance has been suspicious for a while and even band them from talking. She even text my best friend to ask if they were cheating and he lied and pretended he knew nothing because he didn't want to get involved.

Neither of us want to get involved but we feel so bad for this girl. If we say anything they'll know it's from us and are work life will be filled with drama. I wish I could tell her without telling her. Even if I wrote a letter to her anonymously they'd know it was me or my best friend.

I've even thought of taking a selfie with them two in the background and posting it on social media just so it gets back to her so she knows they are still hanging out. But I know they'd still blame me because everything is someone else's fault with them

Updates
1 y
Her family even know he's no good so I pray to God but they get sense in her before it's too late
Would you tell someone if they were being cheated on?
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