Act 3: What admission does Olivia make to Cesario/Viola?And what is Viola's response and why?

Olivia confesses her affection for Viola/ Cesario, and begs to know if Viola does indeed feel the same way. Viola says no, then asks again if Olivia will have anything to do with Orsino; Olivia is constant in her lack of response to Orsino, but makes one last attempt to win Cesario over. Viola warns Olivia as best she can, telling Olivia that "I am not what I am," though Olivia does not guess at the statement's real meaning (III.i.139). Of course she is unsuccessful, and Viola leaves‹but not without an entreaty to return.