[GiRTh]

Similar happened to me. I saw one of my friends wife in a car with another man in a supermarket car park. The car was parked such that I had to pass it while I entered the supermarket so I had a long good look and confirmed it was definitely her. I recognised the number plate too

I told another friend who was closer to him than me and when he told our mutual friend.....he didn't believe him and stayed with her. She did it again about a year and half later an this time he believed us.

The sight of my friend in tears after the second affair is one I will never forget.

So the answer is I dont know which of these options but I will try to tell the wife but probably wouldn't tell her myself.