Totally agree with Gormy I'm afraid !!
Walk away with your head held high, it ain't worth it if he/she's got no respect for you - at least leave with your own intact !!
No I wouldn't. the other person is totally irrelevant to the situation. The problem is between the person and their partner, the 'other' person is just a symptom of what is wrong, so a totally pointless exercise. I've always had an honest relationship anyway, when my wife decided we ought to call it a day I was the first to know about it, which in my opinion is how it should be. It's not the affair you should be worried about, it's the lack of communication.
i did walk away,this happened a long time ago,she was my babysitter,they have since married and have a child.although our marriage did'nt last,we still keep in touch and phone from time to time.