Because, Cassius is too clever. Specifically, he says, "Yond Cassius has a lean and hungry look. He thinks too much. Such men are dangerous."
Cassius tells Brutus that he should be ruler not Caesar. Cassius says that Brutus would make a better ruler than to be second to Caesar.
Cassius. He had a lean and hungry look, apparently, and such men are dangerous.
Cassius was not Caesar. Cassius wanted to kill Caesar for jealousy and some other issues.
he knows heβs the only person he can trust?!!
Cassius wants to kill Caesar
what weaknessess did cassius see in caesar
doesnt like plays. rarely smiles not comfortable with people of a higher rank Caesar dislikes Cassius very much. He says that Cassius thinks too much and is therefore dangerous. Caesar is suspicious of him because he does not delight in things such as plays and music, and hardly ever smiles. He states that Cassius is to be feared, rather than outright saying he fears him.
Cassius is envious of Caesar. because Cassius didn't want to be ruler my anyone. Cassius felt that Caesar had too much power and was bad for Rome.
He thought him to be a shrewd contriver who was always busy judging people's minds. Caesar also reasoned out that Cassius was not gamesome, did not like merry-making like Antony. He said about Cassius that he smiled as if he was mocking at the opposite person. Such serious nature had plans in one's mind. So, he did not trust Cassius.
Cassius and Caesar, according to Shakespeare's play, were childhood friends (Cassius told a story of how he even saved Caesar from drowning in the Tiber River). Obviously, they were once good friends. However, Caesar gained more power and disregarded Cassius (Cassius also became more jealous and was not so friendly in return). Caesar had new friends, like Antony and Brutus, who were loyal to him. Caesar did not need Cassius to be his friend; he felt threatened by Cassius at one point. He said to Antony that he did not trust him (he was a thinker, probably plotting something devious). Caesar had hubris and did not feel threatened, really, by anyone. Obviously, Caesar undermined Cassius and did not care for him as a friend.
In 'The Tragedy of Julius Caesar,' Cassius is the most concerned about Caesar taking power, and accepting the role of king. He believed this was a betrayal of the Roman people's trust, and actually a blasphemy if compared to the glory of the Republic.
Their full names are Marcus Junius Brutus ("Brutus"), Gaius Cassius Longinus ("Cassius") and Gaius Julius Caesar ("Caesar"). Cassius was married to Junia, half-sister of Brutus. Cassius and Brutus were the leaders of the conspiracy to assassinate Caesar