Let him do his spite ... my demerits may speak unbonneted to as proud a fortune as this that I have reached. Act 1, Scene 2, Lines 20-32 (21)
Othello knows about the stereotype surrounding Moors and desires greatly for it to not revolve around him. He tries his best to let everyone know his true self and not the stereotype around him.
Let her have your voice.Vouch with me, heaven, ... And all indign and base adversitiesMake head against my estimation. Act 1, Scene 3, Lines 295-309 (47)
He knows his worth, doesn’t doubt his reputation. Othello believes he is high and mighty so he doesn’t need Desomonda’s father’s approval. Othello genuinely loves Desdemona and wants the best for her and doesn’t care what happens to him.
Amen to that, sweet powers!...That e'er our hearts shall make! Act 2, Scene 1, Lines 213- 217 (73)
Othello can keep his composure and keep his royal status without exploding on everyone. He just seeks the truth and their motives to determine the punishment
I know, Iago, Thy honesty and love doth mince this matter, ... I’ll make an example.Act 2, Scene 3, Lines 262-267 (97-99)
He realizes how much he misses her and is grateful that he is able to be in her presence. They are all madly in live with each other.
This fellow’s of exceeding honesty ... Look where she comes. If she be false, heaven mocked itself. I’ll not believe ’t. Act 3, Scene 3, Lines 299- 318(137)
Othello still wants to believe Desdemona and therefore insists that Iago shows him proof of her infidelity.
Villain, be sure thou prove my love a whore, ... Than answer my waked wrath!Scene 3, Act3, Lines 411-415(145)
Othello believes that Iago is extremely honest and good so there's no need for him to lie, and maybe it's all because he's black and Cassio isn't. He starts to develop insecurities
From this act and beyond, Othello calls Desdemona nasty names, usually whore. Although Desdemona is confuse and innocent, his hurtful comments continue to exist.
(striking her) Devil! Act 4, Scene 1, Line 268(189)
This is the first time we ever see or hear of that Othello used physical violence against his wife. She like the rest(and the audience) are equally as shocked.
It is the cause, it is the cause, my soul. ... It strikes where it doth love. She wakes. Scene 5, Act 2, Lines 1-24(235-237)
Soft you, a word or two before you go. I have done the state some service, and the know’t. No more of that. I... I took by the throat the circumcisèd dog, And smote him, thus. Act 5, Scene 2, Lines 397- 417(263-265)
Othello debates killing Desdemona because he still loves her but he has to stay true to his believes and does it regardless.
Damn her, lewd minx! ... Now art thou my lieutenant. Act 3, Scene 3, Lines 541-545 (151)
Othello believes that Desdemona cheated on him with Cassio and is now plotting his revenge on the both of them.
Was this fair paper, this most goodly book, ... What committed!Impudent strumpet! Act 4, Scene 2, lines 182- 192(197-199)
Right before Othello's final death, he gives a big speech asking for those who tell his story, to tell it the way it was. He admits that he was never jealous but instead manipulated.