I would have him nine years a-killing. A fine woman, a fair woman, a sweet woman!
Was that mine?
Yours, by this hand! And to see how he prizes the foolish woman your wife! She gave it to him, and he hath given it to his whore.
Did you perceive how he laughed at his vice?
And did you see the handkerchief?
Are you not a strumpet?
What, not a whore?
I cry you mercy, then. I took you for that cunning whore of Venice that married with Othello.
By heaven, you do me wrong!
O, heaven forgive us!
No, as I shall be saved.
No, as I am a Christian! If to preserve this vessel for my lord from any other foul unlawful touch be not to be a strumpet, I am none.
Kill me tomorrow, but let me live tonight.
But half an hour! But while I say one prayer!
O banish me, my lord, but kill me not!
It is too late.
Othello demonstrates jealousy in this scene, his fatal flaw that leads to his downfall. Iago has just tricked him into thinking that Desdemona cheated on him with Cassio, and he is so jealous of Cassio that he plans to kill him. Once Othello's jealousy reaches this extreme point, things begin to go downhill. (Shakespeare 4.1.190-200)
Othello's excessive arrogance leads him to accuse Desdemona of cheating on him even though he had no proof, which eventually disgraces him and ruins their relationship. In this scene, Othello repeatedly accuses Desdemona of being unfaithful and she continuously denies this claim. (4.2.93-105)
Othello killing Desdemona results in his final, tragic downfall. This was Othello's greatest mistake. It leads to the loss of his military position, and to his own suicide. (5.2.98-105)