I look at him and say, "If you get any closer, it's not going to end well for either of us. You'll be in the hospital, and I'll be in jail, so why don't you just sit down?"
Wife is now sobbing into the pillow, and he sits down.
After an uncomfortable silence, he asks, "What now?"
My reply is, "I have no idea."
Wife is still crying a little, but sits up. Finally, I pull out my phone and tell them that they are going to tell me everything while I record it all.
They look at each other, and my wife asks what do I mean by everything.
I say, "Everything: how it started, how long this has been going on, when, where, hotels, dinners, etc. Everything."
My wife says, "This is the only time."
To which I yell, "BS! There is no way you'd be comfortable enough to bring him to our bed if this hadn't been going on for some time. If you lie to me again, I'm walking out that door and finding a divorce lawyer."
She starts crying again. So, for the next 10 to 15 minutes, it all comes out: been going on for over nine months. Started with him flirting with her, etc., until he asked her to lunch and she went. A few drinks later, they were at a hotel.