Doctor in the House S05E02 - Men Without Women

Duncan tries to cheer up depressed Dr. Don Harper, whose wife has just left him, but in vain. Duncan himself is pleased because, though there is currently a dearth of pretty nurses to date, the lovely Nurse Dobbs has agreed to go out with him. However she is actually Harper's wife using her maiden name and, seeing her with Duncan, gives her husband the incentive to win her back.