The Third Lover
L'Œil du Malin (original)
The story of a journalist in southern Germany who stays with a novelist and his wife and gradually begins to destroy the young couple's lives.
Starring Jacques Charrier, Walther Reyer, Stéphane Audran, Daniel Boulanger, Erika Tweer, Michaël Munzer, Claude Romet, Louis Le Pin, André Badin, Jean Davis
It's a comedy and drama movie, and has a rating of 7 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Argentina.