What happens
The Duke confides in Proteus that he knows Valentine plans to elope with Silvia tonight using a rope ladder. Proteus, pretending loyalty, offers to help the Duke stop the plan. After Proteus leaves, Valentine enters and the Duke interrogates him about love and courtship, eventually tricking Valentine into revealing his elopement strategy—including the rope ladder. The Duke then banishes Valentine on the spot. Launce and Speed appear, delivering news of Valentine's exile to the outlaws.
Why it matters
This scene marks the catastrophic turning point where Proteus's betrayal becomes actionable. His confession to the Duke—framed as dutiful honesty—is actually calculated treachery. Proteus claims to act out of loyalty to Valentine, but his language reveals the opposite: he's using the 'duty' narrative to justify his interference. What's crucial is that the Duke has already suspected the elopement; Proteus simply confirms it and, more importantly, accelerates its exposure. The Duke's interrogation of Valentine is masterfully manipulative—he draws the full plan out of Valentine by posing as an older man seeking romantic advice, appealing to Valentine's vanity and expertise. Valentine, still trusting and proud, walks directly into the trap.
The scene exposes the fragility of male friendship in the face of romantic desire and social hierarchy. Valentine trusts Proteus completely and speaks freely about his plans. Proteus, meanwhile, has already chosen Silvia over his lifelong friend—a choice the audience has watched form in Act 2, Scene 6. The banishment itself is swift and brutal, delivered without mercy or appeal. What makes it devastating is that Valentine brought it on himself by his own honesty and lack of suspicion. The appearance of Launce and Speed at the end, with their comic commentary, provides tonal relief but also underscores the tragedy: the servants understand the betrayal more clearly than the gentlemen themselves. The scene transforms the play's central conflict from a romantic competition into a moral reckoning about loyalty, deception, and the cost of pursuing desire at any expense.