Still Standing - Season 1 Episode 19
Still Changing

Bill and Linda meet some Bills old high school buddies, who since then has turned his life around. Bill says his wife changed him, which leads into an argument between him and Linda about how they changed each other. Bill decides to grow back his old mustache and smoke cigars, while Linda goes back to hanging out with her drunk friend from high school. After realizing that maybe changing does come for the better, they both go back to their usual selves.