I think the most important part in act 5 scene 3 is when titinus kills himself and then Brutus say”o Julius Caesar,thou art mighty yet,thy spirit walks abroad and turns our swords in our own proper entrails”. I think this means that Brutus is saying that the ghost of Caesar is turning people’s swords into their own body’s which basically means suicide. Brutus try’s to blame the ghost of caesar for his own mistakes