Act 4 Scene 2:

In this scene Brutus doesn’t find good what Cassius is doing. Besides the only thing that makes them have a relationship was Caesar, but now that he is dead, Brutus doesn’t want to be next to Cassius, and this has noticed it. (The only thing that made then be together was Caesar). After an issue starts. This is why Brutus and Cassius go inside a tent, because the don’t want anyone to listen to what they are talking, because they don’t want to make the army weaker by their talk. However Brutus does’t think Cassius same way.