"Why Hamlet is Unkind to Ophelia";This was an essay for English Lit On Hamlet that gives quotes that back-up Hamlet's unkind treatment of Ophelia.

When Hamlet behaves so cruelly toward Ophelia after his "To be or not to be" soliloquy, it shows the audience that he has given up on women and the idea of marriage entirely because of his mother's hasty marriage to his uncle, Claudius, who killed his father. Also, because her father had advised her to "be somewhat scanter of your maiden presence" to Hamlet, Ophelia had given him more support in his conclusion that "Frailty, …

…says further that "those that are married already, all but one, shall live". He tells Ophelia to "get thee to a nunnery" because he is aware of the fact that his mother, Claudius, and Ophelia's father, believes that the source of his madness is Ophelia's rejection of his affections. He wants to make it clear that he will not marry her, as they all want. He does not believe in the sanctity of marriage anymore.