Once a Sinner (1931)

As Diana Barry is preparing to leave New York to marry inventor Tommy Mason she is offered financial assistance from her ex-lover Dick Kent, who still has a thing for her. Refusing she heads to Sparta, where she informs Tommy of her affair with the older man. Tommy tells her that he doesn't want to know the man's name or any details and Diana is happy to forget the past and move on. This decision comes to bite them a year later though, when Kent returns into the picture.