The Passerby
La Passante du Sans-Souci (original)
Starring Romy Schneider, Michel Piccoli, Helmut Griem, Dominique Labourier, Gérard Klein, Mathieu Carrière, Jacques Martin, Wendelin Werner, Marcel Bozonnet, Christiane Cohendy
It's a drama movie, and has a rating of 6.6 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Italy.