"The truth is, sweetie, that if I'd met him around the same time that I met you, I'm pretty sure he's the one I would have ended up with, and who knows -- if tonight goes well -- which I'm sure it will -- maybe eventually I WILL end up with him and not you."
Of course -- this was far from the first time this kind of thing has happened. In fact, when you go out with your wife, you always know there is a reasonable chance she will be leaving with someone other than you and that you will be spending the night alone.
[slightly modified from a MsTara original ]