Romeo actually does not appear in act IV, having been banished from Verona for killing Tybalt in the previous act. In act V, we see that he is still an impulsive young man, but this time, it is for a good reason—he has just received the disturbing news from Balthasar that Juliet is dead. Balthasar, it turns out, is not privy to the plot between Juliet and the Friar, and he does not realize that she is not really dead. Once he receives the news, Romeo makes his way to an apothecary, where he purchases a poison to use for suicide. He plans to return to Verona and die by Juliet's grave. This, of course, he does, and Juliet awakes to find his corpse, and the tragedy is complete. Romeo acted impulsively in returning to kill himself, but the character trait that is clearest in the final act is his sincere and faithful love for Juliet. Early in the play, he was fickle and juvenile in his affection for Rosaline, and some readers and playgoers might believe that his love for Juliet was not as sincere and heartfelt as hers for him. But the final act reveals, in the most tragic way possible, that his love for Juliet is absolutely real, and it is his defining character trait.