What happens in the play makes as much sense if you think Hamlet didn't love Ophelia or if you think he did. Either way leads to the same tragic ending.
Polonius and Claudius send Ophelia to talk to Hamlet to see how he responds to her. They wanted to find out if Hamlet truly was mad because of his love for Ophelia.Hamlet asks whether it is better to live or not to live. Should people suffer with what is going on around them or should they fight? He says that the only reason he and other people are not committing suicide is because they are scared of what might happen to them after death.The king's view has changed. He does not believe that the madness was caused by his love for Ophelia"Madness in great ones must not unwatched go." The king says this because he is not truly sure if Hamlet is mad because of Ophelia or not. He realizes that Hamlet is clever and could be up to something. He could think that Hamlet knew that Polonius and he were spying on him with Ophelia.
According to Laertes, she may compromise her reputation by going too far with Hamlet, only to find later on that a marriage with a different woman has been arranged for him for political reasons. However, we learn from Gertrude that that was not the plan at all and that Gertrude had intended that Hamlet and Ophelia should marry. Claudius would not have resisted her desire in this, because he is deeply in love with Gertrude. Nevertheless, had Ophelia gone too far with Hamlet (and the source material and some productions of the play including Kenneth Branagh's movie suggest that she had done so) she still would have been repudiated by Hamlet in the nunnery scene (III, 1). The bitter sting of Hamlet's repudiation would be all the greater if Ophelia had already become his mistress or (as in some versions of the story) was carrying his child.
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