Act 3 scene 3

1. Desdemona agrees to Cassio’s case because she knows that they are close friends and due to the fact that he helped to get Desdemona and Othello together in the first place
2. When Iago say ‘ha! I like not that’ he is referring to the fact that he can see Cassio and Desdemona talking to each other. By doing this he is making Othello feel paranoid because it makes him think that they are doing something they shouldn’t instead of having a harmless conversation.
3. After Othello repeatedly urges Iago to tell him what's on his mind, Iago says "O, beware, my lord, of jealousy;/It is the green eyed monster, which doth mock / The meat it feeds on." Othello responds with ‘O misery’. By saying this Othello is showing that he has fallen out of certainty of his love to Desdemona as he describes it as a misery. This could then suggest that he wants reassurance and sympathy from Iago and also the truth to what he thinks is happening.
4. Iago says that all the women of Venice ‘dare not show their husbands; their best consciousness is not to leave’t undone, but keep’t unknown’. This is then suggesting that he sees all women to be untrustworthy as they will keep secrets from their husbands. This then reinforces the doubt Othello has at it makes him believe that it is not an uncommon situation, making him question his wife’s loyalty
5. As stated by Thomas Coryat in ‘Coryats Crudities’ the women of Venice are described as Courtezan of Venice displaying them all be to prostitutes and therefore unfaithful.
6. This contextual evidence may then influence Othello’s decision to believe Iago about being unable to trust his wife because during the 1600’s this was the way Venetian women were displayed and along with the fact that Desdemona went behind her father’s back to get married with Otherllo it also suggests that she would do the same to him with another man
7. Iago echoes Brabantios earlier warning to Othello by saying ‘she did deceive her father, marrying you; and when she seemed to shake, and fear your looks, she loved them most’.
8. In this statement Iago makes the statement that it is unnatural for Desdemona and Othello to be together because of his race as he takes reference to his looks and how it was something that she should fear
9. Desdemona produces the handkerchief when Othello has a headache as during the 15th century there was not much medical knowledge and they believed that wrapping the head would cure headaches. However, the handkerchief was not big enough symbolizing that perhaps her love wasn't big enough as the handkerchief was a symbol of Othello's love. However, she is careless with the handkerchief and leaves it behind, perhaps indicating that she is discarding their love or that their love is no longer cared about and isn't strong anymore. Emilia then finds the handkerchief and knew that her husband wanted it. She however, did not know what for and therefore did not realise her contribution to the downfall of Othello and Desdemona's love. 
10. Emilia takes the handkerchief as she doesn't think her relationship is very good and therefore hopes that iago will give it to her as a token of his love. 
11. Iago knows what the handkerchief represents and therefore hopes to use it to show Iago that Desdemona does not love him. He hopes to be able to give it to Cassio so that Othello believe Desdemona gave it to him, suggesting that she loves him. 
12. When Othello returns to the scene upset and angry he holds Iago by the throat and says “Ha, ha, false to me?” meaning ‘you dare lie to me?’
13. Iago gives proof of Desdemona’s disloyalty through an unconvincing lie, however it manages to convince Othello, which raises questions about how great this tragic hero truly is. Iago says “I lay with Cassio lately, And, being troubled with a ranging tooth, I could not sleep. There are a kind of men so loose of soul, That in their sleeps will mutter their affairs: One of this kind is Cassio .In sleep I heard him say ‘Sweet Desdemona, Let us be wary, let us hide our loves’; And then, sir, would he gripe and wring my hand, Cry out ‘Sweet creature!’, and then kiss me hard, As if he plucked up kisses by the roots, That grew upon my lips; then laid his leg Over my thigh, and sighed, and kissed, and then Cried ‘Cursed fate, that gave thee to the Moor!’”
14. Iagos final proof is the handkerchief his wife Emilia found and gave to him. When Othello approaches Desdemona about the handkerchief and wishes her to present it she will not be able to find it meaning Othello will believe what Iago just says- “I know not that; but such handkerchief (I am sure it was your wife’s) did I today See Cassio wipe his beard with.”
15. Othello’s language is noticeable different in this scene as it become increasing monosyllabic and more like Iagos as they start to become closer and closer together. This scene is arguable homoerotic as there is a scene where Iago and Othello exchange wedding vows and become as one, reflecting their shared language type dialect.