At the end of the story The Duke marries Viola and Sebastian marries Olivia. After all of the mistaken identity that arises in the play the people who truly love each other are together at last at the end of the play. In the beginning of the play the Duke was in love with Olivia; Olivia was in love with Cesario; and Cesario is actually a woman named Viola who is in love with the Duke. This love puzzle finally comes together at the end of the play.
I think that the Duke and Viola are meant for each other. The Duke is starving for love at the very beginning of the play. The Duke opens saying "If music be the food of love, play on; give me excess of it, that, surfeiting, The appetite may sicken, and so die. That strain again! It had a dying fall: O, it came o"er my ear like the sweet sound, that breathes upon a bank of violets, Stealing and giving odour! Enough; no more: "T is not so sweet now as it were before. O spirit of love, how quick and fresh art thou"! Viola is just as lovesick. I think that it is good for the duke to be with viola instead of Olivia, he spent so much time chasing her until he was blind that he was the only one chasing between the two. Olivia did not want him. Viola on the other hand ardently did. Viola protest about the Duke, saying, "After him I love more than I love these eye's, more than my life, more by all mores . . ." Viola and the duke had began to grow closer and closer as they talked about what each other loved and was looking for in a wife. I think they deserved each other.
I think that Olivia and Sebastian are perfect for each other. Sebastian was thought to be dead at sea. Olivia was madly in love with Cesario, but unfortunately for her Cesario was really Viola who was in love with the duke. The good part about their union was that Olivia wanted Cesario/Viola, and Cesario/Viola was Sebastian's identical twin so the difference could not be told between Sebastian and Viola.