A young girl rescues a man from a suicide attempt. He turns out to be a sociopath, who begins to take over her life, abusing her both verbally and emotionally, yet she can't seem to tear herself away from him.
Love on a Pillow is a 1962 French film starring Brigitte Bardot and directed by Roger Vadim. It's based on the book called Le Repos du guerrier, written by Christiane Rochefort.