Our Dancing Daughters (1928)

Diana is outwardly the hit of the party but inwardly virtuous and idealistic. Her friend Ann is thoroughly selfish and amoral. Both are attracted to Ben Black, soon-to-be millionaire. He takes Diana's flirtations with other boys as a sign of disinterest in him and marries Ann. Big mistake. Ben and Diana begin to realize their true love for each other and plan a new life together as drunken Ann falls down the stairs to her death.