What is Brutus's internal conflict?

Brutus’s internal conflict in Julius Caesar is between his love for Caesar as a friend and his loyalty to Rome as a republic. He does not hate Caesar personally, but he fears that if Caesar becomes king, he may turn into a tyrant.

Early on, Brutus is already troubled. He tells Cassius that he is “with himself at war.” Cassius notices this uncertainty and pushes him toward the conspiracy by appealing to his honor and his fear of monarchy. Brutus admits that he loves Caesar, yet he would rather live as a poor villager than be ruled by a king. That tension becomes sharper after Cassius plants anonymous letters urging him to act for Rome, including the command, “Awake, and see thyself! Shall Rome, etc. Speak, strike, redress!”

Brutus’s private reasoning shows the conflict most clearly. Alone in his orchard, he decides, “It must be by his death,” even while admitting, “I know no personal cause to spurn at him.” His argument is based on what Caesar might become, not on anything Caesar has already done. He imagines Caesar as a “serpent’s egg” that must be killed before it hatches. This makes Brutus’s choice morally painful: he convinces himself that killing an as-yet-innocent man is necessary to protect Rome.

This same conflict continues after the assassination. Brutus wants the killing to seem honorable and limited, so he refuses to kill Antony and later lets Antony speak at Caesar’s funeral. His principles make him seem noble, but they also help bring about his ruin. By the end of Julius Caesar, Brutus’s tragedy lies in the fact that his best qualities—honor, reason, and devotion to Rome—lead him to betray a man he loves and then to judge himself for it.