"I knew she was up to something," Gaston complains the next morning as Honoré is shaved by his manservant Manuel in his salon.
The about-to-be jilted lover confesses that he's hired detectives to follow Liane, and it turns out that Liane has been conducting an affair with none other than the handsome skating teacher.
His uncle reminds him that he shouldn't take it to heart, that many great men (like Victor Hugo and Napoleon and himself) have been cuckolded just like him.
Gaston wishes it wasn't someone as lowly as a skating teacher, but Honoré and Manuel say that's the way it goes, it's always a swimming coach, a plumber...Manuel continues to list anecdotes until Honoré asks him to shove it, then tells Gaston to cheer up.
Gaston insists he's cheered up, that Liane's common and plain. Anyway, it doesn't matter. He asks his uncle what they'll be doing today.
Honoré, with a twinkle in his eye, announces that they'll go to Honfleur (a famously beautiful port town outside of the city) so that Gaston can catch Liane in the act.
Gaston demurs—he'd rather write her a Dear Jane letter or call her on the telephone. But Honoré insists on an in-person confrontation in order to preserve his pride.
He sings about about how wonderful it will be to make a scene and preserve his reputation by leaving Liane screaming and weeping on the floor. Who would want to miss the opportunity?
Gaston consents, but utters his trademark phrase, "it's a bore!"