Anonymous wrote:Op, when the affair is discovered and your friend finds out that you knew and don’t tell her, you will loose that friendship. Speaking from experience here.
This was my experience. Then DH cheated extensively. People I thought were our mutual friends never said anything to me - never blew his cover and never asked me if I was OK (not even after we publicly broke up). So, his cheating felt like a double betrayal - him and friends who decided to be bystanders. Bystanding is what allowed him to get away with it for so long (I had no clue when I found out, on my own, that he had exposed me to a serious STD he acquired.
It was made worse by the fact all these people were part of a circle of friends that were also professional colleagues. I couldn't talk to them as friends about what was really happening because, frankly, he would have been fired, and I needed him to be able to pay child support. So, I also ended up in polite but distant relationships with people who otherwise would have been mutually supportive to me professionally.
Both the cheating and the betrayal of friendship were very traumatic. In a large part of my life, outside cheating ex, I felt I either had to be very inauthentic, very cautious about whom to trust or cut people off.
I was extremely fortunate that I was able to tell my family and longstanding friends, and they all were incredibly supportive.
Having experienced this, I would never betray a friend in that way. I also would never ask the perpetrator or person with knowledge for an explanation or permission to share. That is one of the consequences - despite a cheater's best efforts, their behavior can become public and thus they don't "own" that information any more.
I would tell a friend exactly what I heard. I would also acknowledge that I don't know if it's true or not or cheating or part of a mutual agreement - and I don't need to know. Just that I didn't feel right keeping such information from a friend and that I would not tell anyone else and that I was there to offer support to her in anyway asked at any time. And then I would just shut up and listen and follow her lead.