"I've tried to explain my belief that a man should not be 'buddies' with another man's wife, but my wife doesn't see it and says they’re just pals."

"At the conference my wife will essentially be 'dating' this guy for five days. I do trust my wife completely. But this guy is single... I’m annoyed that I will be home with the boys while she is on vacation with another man. I can't ask her not to go, and I can't join her. What can I do?"

Advice?