"Yet Brutus says he was ambitious; and Brutus is an honourable man"
This is dramatic irony. Antony is angry what Brutus did. Antony thinks that Brutus is dishonourable and it was an act of betrayal. He repeats that "Brutus is an honourable man" so that the crowd can release that what Brutus did was wrong
"Fearhimnot Caesar; he's not dangerous"
Caesar thinks Cassius is dangerous but Antony is telling him that Cassius isn't. His advice is wrong however because Cassius is a dangerous man
"Friends, Romans, countrymen lend me your ears"
This is a famous speech that Antony says at Caesar's funeral. There is the ruleofthree at the beginning which shows power. This speech turns people against Brutus and the conspirators, making them having to flee from Rome
"I thrice presented hum a kingly crown which he did thrice refuse"
Antony offered Caesar to be the ruler of Rome but Caesar denies it three times. Antony thinks it's wrong that Brutus was saying that Caesar was ambitious