Get a trendy new haircut, change the color, new makeup - whatever. Dress up in a sexy dress, new perfume. Pick him up at the airport, drop him off at the house, and say "Sorry, I can't stay - I'm meeting a friend. Who? Oh, you don't know them. See ya later" Then go out and don't come home until 2 a.m., even if you have to go read a book at Starbucks.
He's confused, but I would do anything it took to shake him out of the "gee, do I want my wife or OW?" dilemma and into the "Hey, wait, I don't want some other guy to start picking up on my WIFE!" mode. (Note that I absolutely am NOT suggesting you date. Just that you be mysterious enough about your activities that he has to consider that possibility).
