Brutus was a very respectful and honorable man. He would do anything for his country. Even if it was kill one of his best friends. And he proves that throughout the book Julius Caesar by William Shakespeare. .
For one the only reason Brutus agreed to be in on the conspiracy to kill Julius Caesar was for the better of all Roman people. He felt it was in the best interest of his fellow countrymen. Brutus even states, "let us be sacrificers not butchers" when talking to Cassius about how to kill Caesar. This shows he thought it was a sacrifice that had to be done for Rome. He did it because it had to be done.
Brutus even contemplated joining the conspirators in the first place. He had to look out for his own life as well. He knew about what Caesar did to Pompay. He turned on him, and that made a huge impact on whether Brutus" decision to join the conspirators. There was that fact and the thing about it being best for Rome.
Caesar" situation with Pompay came back to haunt him. Brutus was a wise man and looked out for himself. He learned from Pompay's mistake of letting "allies" too close. This made Brutus paranoid of Caesar. When talking to Lucious Brutus says "It must be by his death. And for my part I know no personal cause to spurn at him, but for the general. He would be crowned." He knew Caesar was a dangerous and greedy man.
A lot of men thought of Brutus as a very honorable and noble man. Throughout the book they give little clues to this. One is when Brutus asks Cassius if he knows the men at his doorstep and he replies, "Yes, everymen of them; and no man here but honors you." They all respect him. Especially the fact that he is so noble, and always follows up on his word. He respected Caesar even after his death. He lets Antony speak at Caesars funeral. Which was a very bold and honorable gesture. .