I have two friends that I've been close with since middle school. We're real close. Like brothers. Real "three amigos" type shit

Friend A got married recently. Wedding was great. Friend B and I were in the wedding party. Everyone had an awesome time. Except me, because I was carrying a secret. Still am, and it fucking eats me up

Friend A's bachelor party was a week before the wedding. I don't drink, so I was DD. Friend A got pretty hammered as the night went on, but fuck it, it's his night (and I'm here to keep him under control). At one point, he turns to me with this heartbroken look on his face and tells me he fucked up. I asked what he did. "I fucked Friend B's sister." I stumble for a minute and ask when. "Like a week ago."

Asswipe fucked our best friend's sister right before his own wedding

He swore me to secrecy, and we never spoke of it again. As far as I know, he doesn't even remember telling me. I never said anything to his (now) wife, to Friend B, or to Friend B's sister. Not even to my own wife. This was years ago and it kind of never amounted to anything. But that's only because Friend A and Friend B's sister covered their tracks. And I helped them

I'm still sitting on this secret that could destroy a lifelong friendship and two marriages. I feel like saying something would be a betrayal of Friend A's trust. But I know that keeping the secret is the same as stabbing Friend B in the back. No matter what, I'm making the wrong decision

And now it's to the point where I can't stand to be around them. I look at Friend A and see a lying shithead. I look at Friend B and see someone who trusts me when I don't deserve it. Maybe the passage of time has something to do with it. Maybe we've grown apart. Maybe our lifelong friendship had a shelf life all along. Or maybe I'm rationalizing because I'm an accomplice to double adultery. Damn my trustworthy face