He isn't, noticeably. He's a Stoic, and takes all things, the good and the bad, with a cool detached air.
Brutus thinks that all of the power will go to Caesar's head.
In Julius Caesar, common people treated Julius like a god. Brutus knew people wanted Julius to be King, but Brutus feared that "power corrupts; absolute power corrupts absolutely". Brutus thought power centered in one man, Caesar, would overturn the republic.
Cassius convinces Brutus to join the plot to assassinate Julius Caesar by appealing to Brutus's sense of honor and patriotism and by highlighting Caesar's growing power and ambition. Cassius also plays on Brutus's fear that Caesar's power will diminish the Roman Republic.
The main reason is that Brutus believed he was ambitious. Antony does through in some good points how he wasn't ambitious. Caesar was apparently [from Brutus's point of view] power hungry and would make Rome corrupt.
The phrase "Let him be Caesar" is attributed to the character Brutus in William Shakespeare's play "Julius Caesar." In Act 1, Scene 2, the line expresses Brutus's internal struggle about the growing power of Julius Caesar and his own feelings of loyalty and honor. This moment reflects Brutus's conflict between his friendship with Caesar and his duty to Rome.
Getting brutus behind them, claiming to much power
Brutus was among a group of Roman senators that believed Julius Caesar had too much power. Brutus felt that any hope of returning Rome back into some form of a republic would be lost if Caesar was allowed to continue on the path he was following. Brutus believed that Julius Caesar wanted to become the king of the Roman empire. Brutus became a secret enemy of Caesar. He certainly had fear of his own life as Caesar had dictatorial powers and could use them against any internal Roman foe. Based on this Brutus conspired to assassinate Julius Caesar. The deed was accomplished in the Senate chambers and Brutus was among those who stabbed Caesar to death, thus the tragedy of Caesar and the lament of Caesar's friends.
In Shakespeare's "Julius Caesar," Brutus and Cassius's forces are captured by Antony's soldiers during the Battle of Philippi. Specifically, it is captured soldiers from Brutus's camp who are taken prisoner. The defeat of Brutus and his allies ultimately leads to their downfall, further solidifying Antony's power after Caesar's assassination.
Many of the men who helped kill Caesar only did so because of envy or they wanted power but Brutus was the only one to be motivated because of how he thought that if he gave Caesar a little more time to think Caesar would become king and destroy the republic as they worked so hard to get
A question on the passage is "Why did Brutus betray Julius Caesar?" An answer is "He wanted power."
Brutus says this in the play Julius Caesar by William Shakespeare.
In Shakespeare's "Julius Caesar," the two noblemen who do not attend the games are Brutus and Cassius. Brutus is preoccupied with his internal conflict about Caesar's growing power and the implications for the Republic, while Cassius is disillusioned and critical of the way Caesar is being idolized. Their absence highlights their dissent and foreshadows their roles in the conspiracy against Caesar.