Who knew

Of course you did, because your Wife knew you had made the bet. And your best friend knew that she knew, and she knew that he knew that she knew. 

And you, gentle hubby. You knew that he knew that she knew and you knew that she knew that he knew; and you knew that she and he both knew that you knew. 

So with all of this knowledge, you, your wife and your best friend know one thing - that you are now a cuckold. 

Who would have known it?