Fire's Share
La Part du feu (original)
Real estate developer Bob Hansen discovers that his wife Catherine is cheating on him with his partner. He reacts calmly and even encourages their meetings, thinking that this is the only way to not lose them both.
Starring Michel Piccoli, Claudia Cardinale, Jacques Perrin, Rufus, Roland Bertin, Gabriel Cattand, Véronique Silver, Liliane Gaudet
It's a drama and thriller movie, and has a rating of 5.8 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Not found streaming from United Kingdom.