More of a WWYD..
I just found out that a mutual friend has shagged another mutual friend's husband. Husband then told his wife and they are working through things very privately.
I was told in confidence and do not intend to tell anyone.
However, I no longer what to be friends with the woman who shagged someone else's husband... I no longer trust or respect her.
How do I cut her off without telling my DP what she's done?