"Caesar, now be still/I killed not thee with half so good a will"
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Brutus shows regret over killing his friend. Brutus tells Caesar to rest in peace because he himself now is going to be dead. "I killed not thee with half so good a will" means that killing himself is something he wants to do more than he ever wanted to kill Caesar. Death will be Brutus's penance for his most grievous deed.
Brutus regrets the fact that he killed Caesar, and now he is htelling him to rerst in peace, for now he is going to die aswell
Brutus truly feels bad about what he has done, and he feels as if everything is all his fault. He thinks that by killing himself, he can make it all go away.
The Tragedy of Julius Caesar.
Brutus knew that he was not capable of being a good ruler than Caesar, and anyway they considered themselves to be really good friends.
My own idea.