Faithless

An aging director (named "Bergman") conjures in his imagination the central character, Marianne. He interviews her to compose the story of her life-changing affair. Marianne had been happily married to Markus, an orchestra conductor, with a young daughter Isabelle. Her best friend is David, who is seeking funding for a film project. When Markus is away, David approaches Marianne and they go to Marianne's home. There, David surprises her by asking her if they can sleep together. Marianne asserts she sees David more as a brother; she eventually agrees they can sleep in the same bed in nightwear and without sexual relations. However, the two note they are both planning to be in Paris, France, for separate projects. Markus is aware of their travel plans, and Marianne speculates she and David can meet in Paris, and they would not have to deceive Markus about seeing each other there. In Paris, Marianne and David begin their affair. David also asks Marianne about her sexual history, and Marianne shares her list of experiences; but this mostly consists of her relations with Markus, who she said had satisfied her in ways no one else had. This triggers a violent jealous reaction in David.