It's bad to cheat on your wife.
John feels that he and his wife are in a rut, when one of his female coworkers invites him to join her at a romantic restaurant.
John wants to do something different for a change.
John declines the invitation from his coworker and instead takes his wife for the romantic dinner.
John tells his wife that he’s going to visit his parents, but instead joins his coworker for a romantic meal and a night together.
John's wife is pleased with the change in their routine and reciprocates which leads to a revitalization of their marriage.
John's wife finds out he cheated and leaves him.