I'm looking for a story where the protagonist is sent on a business trip by his female boss. His flight is cancelled and she tells him to return to the office. He then accompanies her to a reception, or business dinner at an hotel, where he spots his wife kissing at the the bar with a man who his boss knows. They approach and his boss asks the man who his girlfriend is. He says that they are dating but not serious yet, although he wants to be.