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(or several seperate episodes of cheating). If I caught, or heard of a friend's partner doing the former, I'd be inclined to confront them and put the fear into them, rather than go straight to my friend and spill the beans.
In the latter case, it comes down to whether your friend actually wants to know or not. I, like TiG and others, would definitely want to know so that I could chuck my partner out and move on- I set a lot of store by fidelity and honesty. Equally though, other people would not want to know, and I respect that- there is no right or wrong answer.
So- you'd have to find out what your friend would want. Over a drink or two (with the cheating partner not present, obviously) you ask them this very question in a hypothetical sense, pretending that you're talking about another friend that they don't know. If they come back and say 'well in that situation I'd like to know', then you tell them, albeit probably not on that evening; maybe even let them know anonymously if you're worried about them 'shooting the messenger'. If they say that they'd rather not know, then there you go- you thank them for their counsel and change the subject.
Pretty much the best solution IMO. I would use both the hypothetical drunken indiscresion and the longer term cheating as an example.