How does Cassius end Scene 2 in Julius Caesar?
I am going to assume that you are asking about Scene 2 in Act I...
Cassius ends Act I, Scene 2 with a soliloquy, which is a speech made by a character who is alone on the stage. In the soliloquy, he turns his thoughts towards Brutus, who has just left the scene with Casca. Cassius knows that he needs Brutus's support if he is to succeed in his plot against Caesar, because Caesar loves and respects Brutus much more than he does Cassius, and because Rome holds Brutus in high esteem. If Brutus were to be a part of the conspiracy Cassius plans, he would lend it a great deal of credibility, since Rome has "a great opinion...of his name" (I,2,318-319).
A shrewd man, Cassius plots how to manipulate Brutus so that Brutus will act to promote Cassius's own specific purposes. He will create letters "as if they came from several citizens...all tending to the great opinion" (I,2,317-318), that Caesar must be overthrown, and leave them where Brutus will surely find them. Cassius hopes that when Brutus understands how strongly public opinion is against Caesar, he will be forced to take action.