In Act Five, Scene 3, Cassius orders Pindarus to watch Titinius and report back to him what is happening in the battle. Pindarus mistakenly reports to Cassius that Titinius is surrounded and being attacked by Antony's troops. Upon hearing this news, Cassius orders Pindarus to take his sword and stab him while he covers his eyes. Cassius's suicide is the result of Pindarus's misinterpretation and is not as honorable as Brutus's death. Throughout the play, Cassius's motivations for assassinating Caesar are selfish and ambitious in nature. Cassius's refusal to watch as his slave stabs him parallels his less than honorable life. In contrast, Brutus instructs Strato to hold his sword as he runs into it. Brutus commits suicide because he refuses to live under the leadership of Antony and Octavius. Brutus literally and figuratively faces his death head on. He does not close his eyes and make someone else take his life but instead chooses to run directly into his own sword. Brutus's honorable death reflects his noble intentions throughout the play. Even Antony and Octavius recognize Brutus's noble life after they find his dead body.
Both Brutus and Cassius commit suicide. Cassius incorrectly hears that Brutus is defeated. that is why he commits suicide. He was dependent on Brutus for his leardership. Cassius is giving honor to Brutus in his death. He believes in Brutus. Knowing he is dead causes Cassius to feel hopeless. Cassius is a coward who depended totally on Brutus.
Brutus fights to the end. He rallies Cassius's forces and fights until both armies retreat. It is declared a draw between Brutus' army and Antony's army.
Three weeks later, Brutus finds his army defeated. He would rather die than live under the leadership of men who supported Caesar in his sense of being ovely ambitious.
Brutus has nothing to fear in death. He has lost everything. His wife is dead. Cassius is dead. Brutus would rather die on his own sword than to become a slave under Rome's new condition.
He dies believing in an idealic republic. In honor and glory, Brutus dies. Even Antony admits that no one was more honorable of the conspirators.