One of my favourite films is “The Apartment” (1960) directed by Billy Wilder and starring Jack Lemmon, Shirley MacLaine and Fred MacMurray.
C.C. Baxter (Jack Lemmon) is an office clerk who curries favor with the executives in his office by giving them the key to his small apartment for the odd afternoon dalliance. Among them is his callous boss, J.D. Sheldrake (Fred MacMurray), who Baxter eventually learns is using his place to sleep with Miss Kubelik (Shirley MacLaine), the sweet elevator operator the clerk has loved from afar. When Sheldrake coldly dumps the vulnerable young woman, she tries to commit suicide, but is saved by the intervention of Baxter. As the clerk lovingly nurses the young woman back to health he begins to realize, with the help of epigrammatic neighbor Dr. Dreyfuss (Jack Kruschen), exactly how much of a fool he has been.
Here’s the final scene when Baxter confesses his love to Miss Kubelik:
Bud begins to deal, never taking his eyes off her. Fran removes her coat, starts picking up her cards and arranging them. Bud, a look of pure joy on his face, deals — and deals — and keeps dealing.