If you catch your catch the wife/husband of your best friend in the hotel with another fellow?

Will you tell him/her knowing it might ruin their marriage or just keep quiet.

Just keep quiet and not get involved. If that ruins the marriage. . . then the marriage deserved to be ruined.
Any married woman or man should know when his or her spouse is cheating.
If not. . . he or she must be a m0r0n.
I do not expect anyone to get in my affairs or those of my wife. . . so I do not get in any other person's.
Not my business any hau.

Just keep it to myself for my amusement only.
Let them work it out themselves.

Btw, I have caught many and the spouses already knew. . . so go figure.
Thankful I did not get involved. I would hate for my name to be associated with such a mess.

Bottom line.
Not everything your eyes see you need to gossip about.

@poster
i'll run up to her straight up, confront her & the guy RIGHT THERE in the hotel (she better have a damn good excuse) AND tell my friend exactly what happened. . . . . . . i'll be on the phone telling to get his a$$ over ASAP!
whatever my friend does after that is HIS prerogative but my conscious will be clear!

and i expect nothing less from him if he ever sees my wife/gf in the same situation!