These Thousand Hills

This relatively early exercise in applied psychology by Richard Fleischer was based on a novel by A. B. Guthrie Jr in which rising young star Don Murray played an aspiring social climber with serious childhood issues who courts working girl Lee Remick before cruelly discarding her when she becomes a social embarrassment after initially making the innocent enquiry "Is she anybody's in particular?"

Murray initially naively assumes she's a nice girl since she dresses in green, but that dress has been paid for by Richard Egan, who shows what an utter heel he is by destroying a birthday cake among sundry other misdeeds.