Put away your swords. They'll get rusty in the dew.
You evil thief, where have you hidden my daughter? You devil, you've put a spell on her!
Are you laughing because you think you've won? Now he's saying how she took him into our bedroom!
She says you're going to marry her (Bianca). Are you?
HA! HA! HA! She hangs around me and dangles from my neck!
Even the wind that blows over everything on earth is ashamed of visiting you. You brazen whore!
I swear to God you're accusing me wrongly!
Othello currently has an external conflict with Brabantio. Brabantio is confronting Othello about his marriage with his daughter, Desdemona, and doesn't approve of it. Brabantio wants to take Othello to the Duke of Venice so a punishment can be administered on him. For example, page 25 of Othello is when Brabantio says, "You're something to fear, not to love. It's obvious to everyone that you've tricked her, drugged her, or kidnapped her." Brabantio dislikes Othello since he stole his daughter away from him and doesn't approve of Othello's marriage. This conflict then progresses the plot since it results in Brabantio's approval of Othello and Desdemona's marriage and Iago will eventually use their marriage against Othello as a way to get revenge.
In this scene, Othello is currently experiencing an internal conflict of man vs himself. Othello doesn't want to believe that Desdemona is cheating on him even though he has a suspicion that she is. This suspicion is eating away at Othello as a person and he's in denial right now and is asking for proof. For instance, pages 157 and 159 of Othello states, " Argh! She's cheating on me?...You villain, you better be able to prove that my wife's a whore! Be sure of it." When Othello gets the proof he needs (what the scene above represents), he goes into a state of anguish and only cares about getting revenge on Cassio for "stealing" Desdemona even though it isn't true. This then also progresses the plot since it will lead Othello into falsely accusing Desdemona of being a whore and Othello being manipulated into becoming a part of Iago's scheme.
Othello's faith in Iago's lies about Desdemona and Cassio results in this scene. He currently has a man vs man conflict with Desdemona in this scene and truly believes that she's actually cheating on him. Othello is now yelling at Desdemona for being a whore and cheating on him when it truly isn't the case. An example from page 227 of Othello is, "But instead, my wife, who's supposed to be like the fountain that my children and all my descendants flow from, has rejected me!" This conflict is relevant since it portrays Othello as a different character than he usually is. He's normally polite and generous and this scene portrays the drastic change that Othello's character has gone through because of jealousy and doubt. This conflict also progresses the plot since it shows us that Othello has fallen for Iago's trickery and now fully trusts him and the plot progresses as Iago's plan progresses.