I'm Taking Suggestions

Something new happened today. I got an email from the wife of an online poker buddy. The email asks if my affair with her husband has indeed ended has he has told her.

On occasion at the poker table there is some sexual banter. Nothing you would take seriously of course. It's all done jokingly. And there is definitely nothing that remotely resembles an affair.

I suspect that this husband is having a midlife crisis and has made up this "affair" to make his wife jealous and to see if she still loves and desires him.

But, how do you say this to a woman that believes you have had an affair with her husband? Do you say exactly what I have said here? Or, do you not respond at all? I am not sure what the protocol is here.

I'm taking suggestions.