And this may help to thicken other proofs That do demonstrate thinly
Alas, poor rogue! I think, i' faith, she loves me.
I never knew woman love man so.
Heaven keep the monster from Othello's mind.
Iago is convincing Othello how to get revenge for Desdemona of killing her by telling that Cassio did slept with her and that she was cheating on him.
Iago is manipulating and prejudice Othello by making the things different for him so Othello can be the bad guy of the history by making him mad of her wife Desdemona and making the conflict look real.
After the conflict between Desdemona and Othello the things between them are getting worse and worse, so Desdemona is confused with Emilia at her side talking why Othello could be so angry about.