What we see of Ophelia in Act II is her scene where she describes Hamlet's visit to her closet in a state of semi-undress. She claims to have been "affrighted" by this visit. It is worth noting that she instantly takes her problem to her father, which tells us something about how dependent she is on him. (He has taken pains to make her that dependent of course.) We hear that she has followed Hamlet's instructions to the letter. One commentator suggested that Hamlet's purpose in entering Ophelia's room in this way was because he was thinking of taking her into his confidence, but after taking a good long look at her he realized that he just couldn't trust her. And he was right; she cannot be trusted to resist her father in even the slightest way. In the 2000 Almereyda film starring Ethan Hawke, Ophelia (Julia Styles) was present when Polonius reads her love-letters to the king, and she makes clear that she had neither wanted him to read them nor certainly to reveal them to the king. Styles's Ophelia was one of the most fragile you can see, but at least she showed some spunk. In other productions, she is not even there: she has turned over her love-letters to her father "in obedience" as Polonius says. In many ways this shows what a dishrag she is.
Polonius is sure, at first, that Hamlet would never marry Ophelia, because of the difference in social status, so he thinks that Hamlet must be only trifling with Ophelia, just for sex. Polonius fears Hamlet doesn't really love Ophelia, and he would get Ophelia pregnant, and then abandon her. We see that in Act 1 scene 3. (Later, in Act 2 scene 1, Polonius changes his mind, however.)
Ophelia, in Shakespeare's Hamlet, Act 3 Scene 1
Ophelia was talking to herself just after Hamlet exited from his act of insanity towards her. She was saying how noble/sane his mind use to be. This quote is in Act 3 scene 1. Hope that helps.
In Act 1 Scene 3 of Hamlet, both Laertes and Polonius advise Ophelia to stop seeing Hamlet, in their own ways. Laertes, as Ophelia's brother, gives the explanation that Hamlet, as heir to the throne of Denmark, must ultimately do what benefits the country. That means that though he may love Ophelia now, he will never be able to marry her because she is not of royal blood so it would not reflect well on the country, and because Denmark must come first, their relationship is doomed to end. Laertes says that Hamlet's affections for Ophelia are essentially flirtation and are going nowhere. (Of course he is dead wrong about Ophelia's chances of marrying Hamlet. At her funeral Gertrude says "I hoped thou shouldst have been my Hamlet's wife.") Polonius, Ophelia's father, gives the same advice for a different reason. He basically says that Hamlet is a young guy and offers her affection because he wants her, not because he loves her. He advises that Ophelia should stop seeing Hamlet because what she thinks is love is simply lust.
In Act 4 Scene 1, the loony Ophelia sings a song about St. Valentine's Day.
In Act 1 Scene 3 of Hamlet, Ophelia agrees to reject Hamlet's amorous advances as her father instructed her to do.
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"Where is your father?" (said to Ophelia)
Polonius is sure, at first, that Hamlet would never marry Ophelia, because of the difference in social status, so he thinks that Hamlet must be only trifling with Ophelia, just for sex. Polonius fears Hamlet doesn't really love Ophelia, and he would get Ophelia pregnant, and then abandon her. We see that in Act 1 scene 3. (Later, in Act 2 scene 1, Polonius changes his mind, however.)
In Act 3 scene 1 of Hamlet (the "nunnery" scene), Claudius and Polonius eavesdrop on the conversation between Hamlet and Ophelia. Well, it's sort of eavesdropping since Ophelia knows they are there and if Hamlet does not know at the beginning of the conversation, he figures it out pretty quickly.
Hamlet breaks into Ophelia's chamber sometime near the beginning of Act II. We cannot tell exactly when because it happens offstage. However, it appears that Ophelia has rushed straight from the incident to tell her father, so Hamlet must have been in there when Polonius is talking to Reynaldo.
In Act 3, Scene 1, Claudius and Polonius try to get Hamlet to reveal his private thoughts by setting up a meeting with his erstwhile girlfriend Ophelia. When Hamlet arrives, he probably knows full well that Claudius is lurking somewhere around but does not appear to be sure that Ophelia is party to the trap. Eventually, however, he figures out that Ophelia knows all about it and it makes him very angry.
Laertes thinks that his family is too insignificant to be involved in a royal marriage. He therefore thinks that Ophelia can never marry Hamlet. He is wrong; the Queen says that she hoped Ophelia would be Hamlet's wife.
Hamlet gives his "To be, or not to be" soliloquy. Hamlet tells Ophelia, "Get thee to a nunnery!" Hamlet decides not to kill Claudius while he prays. Hamlet kills Polonius.
Polonius is sure that Hamlet has gone mad with love for Ophelia. See these lines by Polonius in Act 2 scene 1: ~Polonius: Come, go with me! I will go seek the King;This is the very ecstasy of love,...Ophelia: ... I did repel his letters, and denied His access to me.Polonius: That hath made him mad;~ So Polonius thinks Hamlet is suffering from the "ecstasy of love" for Ophelia, which has driven him mad.
This is Ophelia's madscene. It establishes that Ophelia has gone over the edge but also has the more important action in which Laertes confronts Claudius, and is persuaded by him to take his revenge against the person who really killed Polonius, which would be Hamlet. This scene provides the basis on which the final denouement is based.
Assuming you are talking about Act II, Ophelia describes how Hamlet came to her chamber, looking disheveled and unkempt, looking depressed, unable to speak, but looked at her, sighed, and wandered away, distracted.