Chi mi aiuta...? (1983)

Paolo and Carlo are good friends. The first is introverted, disillusioned and intellectual, while the other one is happy and shallow. Despite their differences, they share accommodation. Paolo runs an "alternative" kind of library with a colleague. Carlo plays the violin in a little band. Their lives go on peacefully until suddenly Paolo falls in love with a customer of his own library - Lili, an amateur actress - whom he decides to take home. Carlo doesn't react well to the fact he's got to share the same space with a third person, so he comes up with a weird idea. He flirts with the new girl and manages to seduce her. Paolo thinks his best friend is now guilty of a real betrayal, while Lili is undecided: she's attracted by both the culture of Paolo and the physical attractiveness of Carlo. This love triangle comes to an end when Paolo tries to commit suicide, Carlo feels remorseful and Lili leaves them both, returning to her previous life and still hoping to find her one true love.