Othello's tragedy is most attributed to jealousy and a lack of self-worth as a husband. It is because Othello is so insecure in his personal relationship with his wife Desdemona that Iago is able to manipulate him so effectively.
At first Othello is confident in his marriage to Desdemona, but little by little Iago convinces him that she cannot be trusted. He reminds Othello that Desdemona already deceived a man she loved dearly, her father. Othello becomes confused, suspicious and eventually consumed with jealous rage at the thought that his beautiful wife is cheating on him. This thought so repulses the honorable and dignified Othello, that he responds as if on the battlefield.
"Yet she must die, else she'll betray more men.
Put out the light, and then put out the light:
If I quench thee, thou flaming minister,
I can again thy former light restore,"
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