When Portia kills herself out of sadness for the current state of the Roman Empire and her husband as a traitor, Brutus is still too caught up in his politic pursuit to realize or care that his wife killed herself over his doings. By making 2 announcements of her death, Shakespeare is showing how little her death affects the course of the play. Even if Brutus is told twice, it’s not going to hold him back from continuing his work; he’s not going to spend any time on it. He can’t think about anything beyond himself or beyond anything have to do with politics.
