Answer:
Angrily, Hamlet denies having given her anything; he laments the dishonesty of beauty, and claims both to have loved Ophelia once and never to have loved her at all. Bitterly commenting on the wretchedness of humankind, he urges Ophelia to enter a nunnery rather than become a “breeder of sinners”
He is so cruel to Ophelia because he has transferred his anger at Gertrude's marriage to Claudius onto Ophelia.
Explanation:
