Contempt
(1963)

Camille (Brigitte Bardot) loses all respect for Paul, her screenwriter husband, because he looks the other way when Hollywood film producer Jeremy (Jack Palance) flirts with her. ("All I feel for you is contempt," she tells Paul.) She leaves Paul for Jeremy (even though he's a slime ball), and the two of them promptly die in a horrible car crash.

Thanks Adam!