Cesario makes ready to go, then he pauses; he asks Olivia one last time if she has any words for Orsino. She begs Cesario to linger: "Stay," she entreats him, and "prithee, tell me what thou think'st of me." Cesario and Olivia both confess ambiguously that they are not what they seem, and then Olivia can stand no more. She ends Cesario's adroit evasions of her questions with a passionate declaration of love:
I love thee, so, that maugre [despite] all thy pride,
Nor wit nor reason can my passion hide.
(148-49)
Despite this beautiful and spontaneous declaration of love, Cesario of course cannot encourage Olivia, even as a gesture of friendship. He must, in order to maintain his disguise, reject her declarations of love. He tells her, therefore, in the plainest way he can, that he has but "one heart" and that he has given it to "no woman" — nor shall any woman be the "mistress" of that heart, "save I alone." Thus he must bid Olivia adieu; nevermore will he come to speak of his master's love for her. In desperation, Olivia pleads with Cesario: "Come again"; perhaps his heart may yet change and perhaps he may yet come to love her.
