Effi Briest
Fontane Effi Briest (original)
A young woman is married to a much older man and begins a flirtation with one of his close friends that leads to dire consequences.
Starring Hanna Schygulla, Wolfgang Schenck, Ulli Lommel, Lilo Pempeit, Herbert Steinmetz, Ursula Strätz, Irm Hermann, Karlheinz Böhm, Hark Bohm, Karl Scheydt
Watch "Effi Briest" from streaming services Criterion Channel, Kanopy released in 1974. It's a drama and history movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie.