Jealousy 1: The play opens with a discussion of jealousy. Iago is upset because Othello selected Michael Cassio as his lieutenant. He is jealous of Cassio's position both in the military and with Othello's service. This initial jealousy is the catalyst for the play's sequential plot of mixed jealousy and destruction. Jealousy 2: Brabantio is partially jealous of the Moor for stealing his daughter's love.
Iago is very jealous of Othello because he wants to be in a better position but he is out ranked by a moor. He is angry that a Moor has power over him. Throughout the play he makes mention of Othello’s color and is negative about it. Then, Iago thinks that there is no way that a woman as lovely as Desdemona is going to love someone like Othello. Iago is jealous of him because he suspects Othello has slept with his wife Emilia.
All three villains may differ in many ways, yet it seems they share a common urge for power, control and a use of sadistic measures. Jealousy is a very powerful emotion that can cause resentment and envy, creating strong anxieties in villains. This enviousness is a common motivational force for socio-paths. Both Iago and the Duke take on this form of motivation, in order to justify their actions that lack morally-correct social behavior. The Duke’s duchess is flirtatious in nature and this displeases the Duke “Sir, ‘twas not her husband’s presence only, called that spot of joy into the duchess’ cheek”.
Jealousy in Othello results in the tragic ending like in the beginning of the play, Iago was jealoused of Cassio because he wanted to get Cassio’s position as a lieutenant, Rogerigo was jealoused of Othello because Desdemona loves Othello and not him and Othello was jealoused of Cassio because he thought that Cassio loves Desdemona more than him. Roderigo was jealoused of Othello because Desdemona loves Othello and not him. He was willing to do anything to win her love. It is the jealousy which moves him to do many evil things in the play. He gave a large amount of money to Iago to get Desdemona but he failed.
Iago feels that the best way to do so is by manipulating Othello telling him that his wife is cheating on him with Cassio, who Iago coincidently hates as well. Iago reveals, “That thinks men honest that but seem to be so, and will as tenderly be led by the nose as asses are. I have ‘t. it is sengender’d. Hell and night must bring this monstrous birth to the worlds light” (Shakespeare 1.
Iago’s mendaciousness scorched Othello’s sanity beyond repair. Iago’s villainous behavior and Othello’s radical demeanor both stand for part of every man in contrasting ways. Each if those qualities is regrettably embedded within each of us. The qualities he thrives on throughout Othello, by William Shakespeare, are the ones we’re most ashamed of. In his soliloquy in Act 2 Scene 2 Line 380 he’s especially brutal towards Desdemona in his plans showing no shame what so ever.
Second, this shows that Tybalt was malicious when it came to the Montagues and he felt hate whenever he saw anyone of them. To sum it all up, Tybalt's unfriendly and resentful approach to the Montagues were one of the many reasons he bid farewell early in the story. Tybalt's turbulence was another one of the main reasons of his early termination in Romeo and Juliet. As an example, in the first act, Tybalt threatened Benvolio and said, "Turn thee, Benvolio. Look upon thy death."
Although Romeo and Juliet is a powerful and passionate romance, that romance is surrounded by violence, hatred, and chaos, and ultimately, that deep, passionate romance causes so much of the violence in Verona. Juliet herself acknowledges this in act one scene 5 in saying “My only love sprung from my only hate” (Shakespeare 1.5.138). Even Juliet realizes the violence of loving someone, when their families have a strong dislike for each other. Even with knowing this she pursues with the relationship anyway, a fact that only incites further violence and contempt between Montague and Capulet. As shown near the end of book, where Romeo and Juliet’s deep love for one another results in a significant amount of violence.
Iago’s murder of Emilia could also come from the general hatred of women that he displays. Emilia can be seen as a cover up to Iago’s true sexuality. When Iago tells Othello, “I am yours favour” it sets up the idea of Iago having homosexual feelings for Othello, these words sounding like a wedding vow. He certainly seems to take great pleasure in preventing Othello from enjoying marital happiness with Desdemona by framing her to be seen as unfaithful to Othello also he expresses his love for Othello frequently and effusively, for example; "…I lay with Cassio lately…. In sleep I heard him say, "Sweet Desdemona, Let us be wary, let us hide our loves!"
Iago gradually through the play gives pieces of information to Othello that form the wrong picture in his mind and causes him to be blinded by jealousy so deep that he eventually kills his wife. Othello’s heritage leads to his insecurity. Othello is referred to as the “moor” a term describing dark-skinned people. Dark is thought to be evil and white pure. Othello’s age was also great cause of insecurity.