There are however, a number of inconsistencies inherent in his self-advertising exclamations, which provide evidence of the falseness of his love: Firstly, he does not fulfill his own demands on true love.
Do not extort thy reasons from this clause, for that I woo, thou therefore hast no cause; but rather reason thus with reason fetter: love sought is good, but given unsought is better.
This quote indicates aspects of passion, exalted expression of emotion, and worship of beauty. He, apparently, does not entertain real feelings towards Olivia—the alleged object of his desires—but rather emotes his sentiments.
Proof of this is shown in various forms throughout the novel, beginning with Orsino's obsessed love of Olivia. In fact, it is often rather Cesario than Olivia who occupies his mind.
Viola, a woman who has nothing and is lost in a strange place, disguises herself as a young gentleman called Cesario, that ends up working for Duke Orsino. He criticizes, manipulates and entertains the other characters while causing them to reflect on their life situations, which is similar to the way a playwright such as Shakespeare interacts with his audience.