Ophelia

           'Tis in my memory lock'd, And you yourself shall keep the key of it." (I.3.72)
            She loves and respects her brother. This is important because it establishes their tight brother-sister relationship. She wants to be a good sister and listen to her brother, and her brother demonstrates his love for her by giving her warnings because he cares for her.

             "And hath given countenance to his speech, my lord, with almost all the holy vows of heaven. " (I.3.100)
               She likes Hamlet back. Although she does want to obey her father and brother, it comes at a heavy cost. Even here she can be seen as making a case for him to her father. She has invested in the fact that he has sworn his love to her, and she wants to love him back.

              "Indeed, my lord, you made me believe so." (III.1.19)
                Here we have it. The words are out and Ophelia is fearful that Hamlet's madness has caused him forget the vows of love he swore. She reminds him here that it was he who made the first move, and not she. Yet though she has rejected his love at the command of her father, deep down she desperately loves him back.

                "To-morrow is Saint Valentine's day, All in the morning bedtime, And I a maid at your window, To be your Valentine. Then up he rose and donn'd his clo'es And dupp'd the chamber door, Let in the maid, that out a maid never departed more. " (IV.5.31)
                  There were things going on behind the scenes and even before the play started between Ophelia and Hamlet. In her madness here, Ophelia recollects how she and Hamlet had sex, and she came on to him. He let her in, but she never was free of him again since that night, as implied by the last line. This part in the story reveals the true reason why Ophelia was so distraught over Hamlet's madness.

                "'Before you tumbled me, You promis'd me to wed.' He answers: 'So would I 'a' done, by yonder sun, an thou hadst not come to my bed.'" (IV.5.51)
                  This is actually heartbreaking. Ophelia seems to repeat a little dialogue that happened between Hamlet and herself. The "holy vows" that Ophelia mentioned before seem to have been matrimonial vows, giving another reason why she has gone crazy. She was going to be married! But because she slept with him, Hamlet has refused her. All of these things bear down hard on Ophelia's conscious, and she cannot carry them.