Your wife is making it clear to you that if you truly love her -- which you both know you do -- you will step aside to give her and your best friend the time and privacy they need to explore their feelings for each other.
She never asked for your permission to start dating him, but when she told you that he had asked her out, and told you how much she liked him and how attracted she was to him, you had strongly and enthusiastically encouraged her to say yes. And now, you are as nervous as she is -- with both of you hoping the date goes well and that it's just the first of many.
Your wife is right, of course. You've never been able to satisfy her -- and your best friend always can. So as much as you wish you could have satisfying sex with her, you know she would much prefer for you to call him to come over to do for her what you're unable to.
Cruel, but fair. She deserves better. @myheartinherhands
Bart Tracer’s hotwife erotica at Amazon.com: http://bit.ly/BartTracer