Disclaimer: I read the first half of the first page, skipped ahead, and read the last page.
I can see where she is coming from. Do I think it is necessarily right? No, but I can still understand her opinion.
Say you're 30 years old and you've been married for 2 years. Your wife, unbeknownst to you, has been having an affair for the past 6 months, but just ended it. The guy doesn't tell you. She doesn't tell you. You stay together. You raise a family and have the greatest years of your life. Fifty years later, she's dying and decides she wants to finally come clean. She tells you everything.
At that point, you could think to yourself, "Hmm, if she told me back then, it could have ended our marriage. Maybe we would have stayed together, but things probably wouldn't have been the same." Instead, you realize you lived out a damn near perfect life in ignorance of the situation and couldn't be happier.
Obviously, the situation I presented is a one-time sort of thing, but maybe OP's situation with his buddy's wife is the same thing. Maybe he'll come home and they'll all grow old together as best buds and blah blah blah. Maybe she'll keep cheating on him and shit hits the fan. Who the fuck knows? Who really cares? I still think this is a troll thread.