
Silvius is the forest's constant, unrewarded lover - his hopeless devotion to Phebe provides the play's clearest parody of romantic suffering, and his eventual marriage to her, secured only because Rosalind closes off her alternative, completes the pattern of forest matches without pretending his patience actually won her heart.
Silvius is a young shepherd introduced mid-lament to the older shepherd Corin, describing a love for Phebe so consuming that even his passing complaints become, in the play's ear, a small parody of every overwrought lover it contains. His devotion is constant and entirely unrewarded - Phebe treats him with open scorn throughout the middle acts, and Silvius accepts the treatment with a patience that borders on the self-defeating.
His willingness to serve as messenger for Phebe's cruelty is the clearest expression of this pattern: he carries her insulting letter to Ganymede in Act IV believing, or hoping, that it might contain some kindness, and reads it aloud without protest even once its scorn becomes obvious. Rosalind's exasperated response - telling him plainly that he is being used and that Phebe does not love him - barely registers; Silvius's devotion does not depend on being reciprocated.
His patience is finally rewarded when Rosalind, resolving every romantic thread at once in Act V, extracts from Phebe an agreement to marry Silvius if she will not have Ganymede - and when Ganymede is revealed as a woman, Phebe's alternative evaporates and she accepts Silvius after all. The play offers no indication that her feelings have changed, only that her options have narrowed to exactly one, which Silvius, characteristically, is delighted to accept regardless.
Silvius is motivated by an unwavering, apparently unconditional love for Phebe that persists through open scorn and active humiliation, requiring no encouragement whatsoever to sustain itself.
Silvius's devotion is total and almost entirely unreflective - he does not seem to consider whether Phebe's treatment of him warrants reconsideration, and the play treats his patience with a mixture of sympathy and gentle mockery, letting Rosalind voice the exasperation on the audience's behalf.