"Based on only my word, you must believe your wife is cheating on you!"
"How could she? I propose we kill her AND the man she is cheating with!"
"That is a FANTASTIC idea!"
Cassio is injured, Roderigo is dead, and Othello is about to kill his wife. This is all going perfectly and nothing will ruin it!
"I killed my wife. What have I done?!"
Jealousy was Othello's hamartia, the fatal flaw that lead to his death, in the scene where Iago told Othello Desdemona was cheating and he immediately believed it and flew into a rage. (Othello 3.3)
A Planning Session For: The Murders of Cassio And Desdemona!
Hubris, or excessive arrogance that leads a person to commit an act that they will be punished for, is what leads Iago injure Cassio and murder Roderigo, and influenced him in his manipulation of Othello. (5.1)
Iago, I'd kill you, but you'll be in more pain if you live than if you die."
Othello killing his wife, Desdemona, is his ate, or the act performed by a hero that leads to their downfall. In Othello's case, his downfall comes at his own hands. (5.2)
The reversal of Othello's fortunes from favorable to awful comes as he and Iago begin plotting Cassio and Desdemona's deaths. (4.1)
This is the moment when Othello realizes he has been manipulated by Iago and killed his wife for no reason. He also realizes that he can no longer live with himself and he is going to take his own life. (5.2)
Othello meets his nemesis, or inescapable justice for a hero, when he takes his own life. (5.2)