The Naked Sun (1958)

A young, struggling couple are making every sacrifice so they will one day in the not-too-distant-future, have enough money to get married. As they have agreed on this procedure, it comes as a shock to the young woman to find out from her husband-to-be that he just loaned all the money they had saved to a friend. She is understandably miffed, and a big disagreement results. But after some time goes by, she discovers why the friend needed the money so badly, and the couple are back on solid footing again.