Why did Iago want Cassio to ask Desdemona for help in restoring Othello's faith in Cassio?

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Iago's ultimate plan is to make Othello suspicious of Michael Cassio and to make him believe that Cassio is having an affair with Desdemona. Iago is jealous and upset that Othello offered the position of lieutenant to Michael Cassio and is trying to make Cassio lose favor with Othello while simultaneously ruining Othello's marriage. After Iago manipulates Cassio into getting drunk and fighting Roderigo, Othello fires him, and Cassio laments his situation. Iago then suggests to Cassio that he petition Desdemona to win her husband's favor back. Cassio trusts that Iago is helping him and asks Desdemona for help. Both Cassio and Desdemona are completely unaware that Iago has lied to Othello about them carrying on an affair. Iago wants Desdemona to encourage Othello to reinstate Cassio, because it will make it seem like she is love with him. Essentially, the more Desdemona begs Othello to reinstate Cassio, the more Othello believes in his wife's infidelity. By tricking Cassio into petitioning Desdemona for help, Iago cleverly manipulates Othello into believing that his wife is carrying on an affair with his former lieutenant.

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In asking Desdemona for help in restoring Othello’s faith in Cassio, Iago has drawn each of the players together for his own cruel drama.

Iago is intent on the downfall of those around him, including Cassio, Othello and Desdemona. He wishes Cassio to be out of favour with Othello as he believes that Cassio has taken the position as Othello’s lieutenant which should have been his

He, in good time, must his lieutenant be,
And I—God bless the mark!—his Moorship's ancient.

He is therefore angry with Cassio and Othello.

Were I the Moor, I would not be Iago.
In following him, I follow but myself;

Iago’s plan for revenge involves making Othello mad with jealousy in implying that Othello’s wife, Desdemona, is being unfaithful to him with Cassio. Iago believes that Othello has slept with his wife, Emilia, so such revenge, he sees, is appropriate. He is happy to condemn Desdemona, and turn her virtue ‘black as pitch’ in the process. He has no respect for her as he has no respect for women in general.

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