Pardon Mon Affaire, Too! (1977)

Marthe Dorsay, of all people, is having an affair--after all, Étienne has solid proof in his hands in the shape of a rather compromising photograph. Green with jealousy, the cuckolded husband embarks on a mission to identify her mysterious lover, convinced that his adulterous wife will soon make her first mistake; however, all efforts are in vain. But as the love lives of the four inseparable friends become more and more complicated, buying an idyllic country house just might be the distraction they need; however, their decision certainly has a price. Will the boys ever find what they are looking for?