All in the Family S07E12 - Archie's Secret Passion

Archie comes home to find Edith in an usual mood, it seems she ran into some old high school friends, Bummie and Dolores and she has invited them over for dinner. Archie confides in Mike that he once had a brief encounter with Dolores before he married Edith. Little does he know, Edith already knows about their fling.