Certainly, if you are the lady of the house, you are doing yourself an injustice because what is yours to give away isn't yours to withhold, (I.v.171-172).
Viola enters to address Olivia on behalf of Duke Orsino Act 1 Scene 5
I cannot love the Duke. I am in sworn mourning for my dear brother who lost his life recently. For this last time, I would like you to tell Orsino that I do not love him.
Most certain, if you are she, you do usurp yourself; for what is yours to bestow is not yours to reserve, (I.v.178-181).
Cesario continues to address Olivia.
Get to the point now. I’ll let you get away with skipping the praise.
Good job Olivia! It's a good thing you rejected the Duke from marriage because that just makes it even easier to meet your match. Sir Andrew! I will never understand why you are in mourning but if it means reducing your options for marriage I'm all for it.
Sir Toby contemplates what happened.
Olivia tells Cesario to go.
Get you to your lord. I cannot love him. Let him send no more— Unless perchance you come to me again To tell me how he takes it. Fare you well. I thank you for your pains, (I.v.153-157).
Run after that same peevish messenger, The county’s man. He left this ring behind him, (I.v.274-276).
Anything for you, my lady.
Malvolio chases Cesario
Sir Toby gets his own theory on what happened.
Finally, the Duke will realize that he is not loved after this. But why would Olivia send a ring to Cesario when he didn't even come in with a ring. Wait a second. Does Olivia love Cesario now! Will she ask for his hand in marraige! Oh No!