Question

What conclusion does Ophelia draw from Hamlet’s behavior in act III, scene I, in which he tells her to “Get thee to a nunnery”?

Answer 1

The conclusion that Ophelia draws from Hamlet's behaviour in Act III, Scene ! is that He has lost his mind. She exclaims aloud to please make him normal again and bemoans the man that he once was and fears for the man that he is now. 

Answer 2

The correct answer is that he has lost his mind.

Ophelia thinks that Hamlet has finally gone completely mad after saying those words to her. She is confused because one day, he would be totally normal, and the other, he would be saying such phrases to her that hurt her. She wishes he would be normal again and that they could be happy, but unfortunately, that doesn't happen as she kills herself, and he is murdered in the end.