Analyse the theme of betrayal in Much Ado About Nothing and show how its use has both good and bad outcomes.

In Much Ado About Nothing, betrayal is at the heart of many of the problems of the play, but it also ends up being the key to its happy ending.
Initially, an instance of betrayal sets up one of the main problems of the play. Don John, the envious and wicked brother of Don Pedro, wants to hurt his brother in any way possible. One way that he sees to do this is to ruin the marriage of Claudio, who is a particular friend of Don Pedro. Don John and Borachio devise a plan to fool Don Pedro and Claudio. Borachio says that he is intimate with one of Hero's waiting women and that at any time of night he can make the maid appear in Hero's window and pretend to be her. The two men plot so that Don Pedro and Claudio will see the maid (Margaret) and Borachio having sex in Hero's room. Margaret will wear Hero's clothes and Borachio will call her "Hero." Don Pedro and Claudio will then think that Hero is not a virgin, and this will ruin the wedding of Claudio and Hero. This does indeed play out exactly as the men plan, and it sets off a whole series of problems in the play, including this ruined marriage and several vows of revenge on either side.
However, betrayal also resolves the problem. Hero faints during the wedding, and most of the wedding guests assume that she is dead. Hero, who has only fainted, is hidden by her family until her good name is cleared. Once her name is cleared, her father, Leonato, tells Claudio that he can make up for the ruined wedding and the false accusations by marrying his "other" daughter. This "other" daughter is Hero in disguise, but Claudio agrees to this new wedding. At the alter, this disguise is revealed, and Claudio is happy to find his original bride restored to him. In this case, betrayal solves the problem and rewards Claudio with a happy marriage.
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