Fatal Vows season 7 episode 11
Episode title: To Kiss or To Kill
Despite the 15-year age gap between them, April and Brad Smith are happily married. But when his job forces him to be gone for days and weeks at a time, and April's dreams of motherhood fall apart, she turns to other men for consolation and one even moves in with the couple. When Brad is ultimately replaced as the man of the house, everyone pays a price.
