Describe the character brutus as either a betrayer or a patriot

In Act 1, Cassius is trying to persuade Brutus against Caesar. This would make him a betrayer. It shows that Cassius is against Caesar in all ways possible. Especially when he saved Caesar and he acted like a little sick girl. Cassius's persuasion eventually wins over Brutus and that's why the outcome of Julius Caesar, was what it was.