Moral Dilemma...
A friend of mine (no, it's not me, it really is a friend of mine) is having a 'secret' affair. Their partner doesn't know - yet - but word is beginning to spread, so they may find out sooner or later if the affair continues. Should I say something to my friend i.e. that I, and many other people, do know what's going on or should I mind my own beeswax?