Iago is filled with hatred and anger, with a goal to make everyone just as jealous as he is. He does through his deception and manipulation of the characters, especially Othello. Iago causes much of the situations by creating lies and implementing misleading situations. Iago always tries to start thing to make others get torn apart. The action of Othello's jealousy hinges on the role and reputation of the intermediary, knowledge of which has been lost to modern cultural perception (Hays). Othello's jealousy is tied with the relationship of the mediator. He is jealous about the other characters and how they are talking to Desdemona.
The theme of jealousy is displayed throughout the play as it changes the character’s actions. Jealousy shows greatly on the main characters of Iago and Othello and show how it affects them. As seen in the character's, jealousy causes people to change in horrific ways. Jealousy causes Iago to make his life around jealousy and sets out to destroy Othello. Othello turns monstrous from jealousness and murders his wife as a result. It totally changes him into a new person that wants blood and