How does brabantios attitude toward roderigo change in the course of this scene?

In the scene, Brabantio initially views Roderigo as a confidant and ally, expressing trust in him to help confront Othello regarding Desdemona's elopement. However, as Brabantio becomes increasingly agitated and distressed over his daughter's marriage, his attitude shifts to one of suspicion and disdain towards Roderigo, whom he previously relied on. Brabantio's frustration leads him to question Roderigo's loyalty and usefulness, revealing his growing desperation and anger rather than appreciating Roderigo's support. Ultimately, Brabantio's changing feelings reflect his vulnerability and the chaos surrounding his loss of control over Desdemona's choices.