You can tell the wronged party
And won’t that stir up a hornet’s nest. Your friend gets pissed because you wouldn’t cover his lie and he’s in hot water with an angry, hurt wife. His wife gets pissed at you, and maybe your wife as well, because you “must have known about this” despite your protests to the contrary. And the woman who was played for a fool is pissed because her marriage is severely damaged, if not over, and she’s got a whole new set of worries about STDs.
