Game of Four
Détrompez-vous (original)
When a man & woman discover their spouses are having an affair with each other, they secretly plot to break them up and win them back
Starring François Cluzet, Mathilde Seigner, Roschdy Zem, Alice Taglioni
It's a comedy movie, and has a rating of 6 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Not found streaming from United States.