Juliet defies the wishes of her only friend and mentor the Nurse.
Up until this scene the Nurse, her maternal figure and confidant, the Nurse sides with the Capulets and recommends that Juliet does the same after her argument with her parents over marrying Paris. The shocked Juliet responds, (3.5. 228) "Speakest thou from your heart?" Juliet, distraught, because the Nurse does not support her wishes to be with Romeo. She finds it hard to believe that the Nurse would have her break both legal and moral laws in marrying Paris. She feels betrayed and thus ends her trust in the Nurse's confidence. Juliet’s final and desperate hope goes to Friar Lawrence in the hopes that he may help her. "If all else fail, myself have power to die" (3.5.244). That quote from Romeo and Juliet shows as dramatic irony because we know her fate and she doesn’t, so when she talks about death it foreshadows later in the
play.