How do you tell someone their partner is cheating?

Keep your mouth shut and do nothing. It's really none of your business and you'd be grateful of the silence if it were you who'd been caught cheating. Anyway, if you tell him and he believes you, he'll resent you for ending the relationship and if he doesn't believe you he'll resent you for calling his bird a slut. Either way, she'll definitely hate you. Just leave well alone is my advice.

Jam it back in, in the dark.

Originally Posted by Spike

What is up with this bullshit? What kind of friends do you guys have? What kind of friends are you people?

"Hey some asshole girl is doing something terrible to my friend. But hey, I don't want to tell him because he'll get mad at me! Waaaaah I'm a big baby who has no confidence in myself or my friendship with others. Waaaaah!!!"

Do the right thing for your friend.

Nobody likes a snitch though, no matter how glorious and white knightly the cause seems. There's certain things that just aren't your business and other people's relationships is one of them. There's looking out for your mates and there's being an interfering busy-body and with something like this, you'll always be perceived as the latter.

Unless, you only have like one friend in the world, it's safe to say that eventually enough people will find out about this bird cheating and the rumour will get back to him, that's how these things work best. A well known rumour from an indistinct source is always infinitely preferable to being confronted by a mate sticking his beak in.

There's nowhere I can't reach.