"...as I slew my best lover for the good of Rome, I have the same dagger for myself, when it shall please my country to need my death" (3.2.62). Brutus is establishing his credibility to the Roman people by saying that just as Caesar was killed, if Brutus were ever the same as Caesar, he would deserve death as well if it meant for the better of Rome.
"...Brutus' love to Caesar was no less than his. If then that friend demand why Brutus rose against Caesar, this is my answer: —Not that I loved Caesar less, but that I loved Rome more" (3.2.61). Brutus is showing a lot of emotion by letting the Romans know he killed Caesar for the love of Rome, not because he didn't love Caesar.
"As Caesar loved me, I weep for him; as he was fortunate, I rejoice at it; as he was valiant, I honour him: but, as he was ambitious, I slew him" (3.2.61). Brutus is stating the fact that Caesar was killed because he was ambitious.