That's Life - Season 2 Episode 14 Behind Closed Doors
Overview: As Paulie's birthday approaches, he discovers that Jimmy is gay; Lydia finds a new apartment right above the Cucina, and reunites with Mack; Frank and Dolly get an unpleasant surprise when they enter Lydia's new place without knocking; Lydia discovers that Jackie and Mack had a brief affair fourteen years ago.