I knew there would be trouble when they walked into the bar.
Not physical, getting somebody's ass whipped trouble, but emotional, I don't want to hear this shit trouble.
Up until a few months ago, I would have considered them friends. Even when things went to hell, if they had just kept their mouths shut they would have been fine.
The ones I found knew about her affair I dropped like a rock, making it very clear they were no longer my friends. Of course, they tried to argue, they didn't want to take sides, they hoped she'd figure out it was destructive behavior, she still loves you, blah, blah,...