Taxi (1978)

Season 3, episode 1

Louie and Zena are running into trouble in their relationship, and Zena dumps him after confessing that she's been dating Dwight, a bartender at Mario's. A depressed Louie tells Alex about it over drinks at Mario's, and when they suspect that Dwight is working the bar, Alex goes up to talk to him. Dwight then tells him that he's breaking up with Zena for getting serious too quickly. Alex shares the news with Louie, who sees an opportunity to get Zena back on the rebound. Zena initially rejects him, but after Louie gives a heartfelt speech about what Zena means to him, she takes him back, despite her better intentions.