The Love Boat (1977) : 1x10

An advice columnist neglects her husband to devote all her time to her fans, prompting him to seek affection elsewhere. A man with a negative history with Capt. Stubing fills in for the ailing chef. A frequent passenger, who is depressed about his impending divorce, winds up on the same cruise as his pregnant wife (who has failed to tell him about the baby). They somehow keep narrowly missing each other.