Woman in a Dressing Gown (1957)

Amy and Jim Preston have been married for 20 years, but in Jim's eyes, Amy has become sloppy about both the house and herself. Jim has fallen in love with Georgie Harlow, a fellow office-worker who is young, pretty, and willing. Jim finally asks Amy for a divorce so he can marry Georgie, and Amy pleads for him to stay, but he walks out. Eventually he realizes that he cannot go through with the desertion of Amy and their teenage son Brian, and he returns home to them.