Final answer:
Roderigo is angry with Iago because he realizes that Iago has been manipulating him for his own benefit.
Step-by-step explanation:
Roderigo is angry with Iago now because he realizes that Iago has been manipulating him for his own benefit. Initially, Iago convinces Roderigo to stay in Cyprus by promising him that he will win over Desdemona and that they will be able to spend time together. However, as the play progresses, Roderigo becomes increasingly suspicious of Iago's true intentions and realizes that he has been deceived. Roderigo is angry because he feels betrayed and used by Iago.