I've been in that kind of a situation. I was the one who was mostly affected given they were all my friends. FYI: Some in our group were not close to the hubbies or the wife etc hence they were just partly affected. Given too that the girl i was closest to was having an affair with my best buddy which i didn't even have a clue. Luckily, when the guy got married a month after the affair and my BFF's hubby found out about the wife cheating on him. My Bffs' hubby was so forgiving and despite that it hurt him bad, he was willing to make things work out again between them. One can hardly find guys of such character nowadays.
Yup, I agree these types of situations make everyone feel ostracized, lots of uncomfortable moments. Such a sticky situation indeed :ninja