The Affairs of Julie (1957)

Juliane Thomas is an ambitious but unemployed young writer. After breaking up with her lover she works at a dentist friend's to make ends meet. One day she instantly falls in love with one of the patients (Jean Berner) and promptly writes a movie script about the encounter in which she projects her own fantasies about how things will turn out eventually. By coincidence this movie script is picked up by a film director who happens to be Berner's closest friend. From then on things become very complicated.