In the first scene of Othello, when Iago and Roderigo her that Othello has married Desdemona, Iago's reaction is to instruct Roderigo to wake up Desdemona's father and get him to have the couple arrested. Roderigo obeys. Later, when the Venetian officials have accepted the marriage and Roderigo is about to give up and "drown [him]self," Iago tells him not to despair; he will find a way to let Roderigo sleep with Desdemona, even though he can't marry her. He also demands all Roderigo's money.
Later, in Cyprus, Iago keeps taking money and jewels from Roderigo, pretending that he (Iago) ia acting as a go-between and giving them to Desdemona. Roderigo does eventually begin to suspect that he is being cheated, but Iago directs his suspicions towards Cassio, as being his main rival; lures him on to attack Cassio; and finally kills Roderigo himself. Roderigo's last words are: "O damned Iago, O inhuman dog" as he finally sees how completely he has been deceived.
Later, in Cyprus, Iago keeps taking money and jewels from Roderigo, pretending that he (Iago) ia acting as a go-between and giving them to Desdemona. Roderigo does eventually begin to suspect that he is being cheated, but Iago directs his suspicions towards Cassio, as being his main rival; lures him on to attack Cassio; and finally kills Roderigo himself. Roderigo's last words are: "O damned Iago, O inhuman dog" as he finally sees how completely he has been deceived.