How to other characters treat or respond to Ophelia?

In general, the characters are protective of Ophelia. Her father and brother warn her against Hamlet, suggesting that he might "use" her without ever being serious about her. Hamlet, finding out the Polonius is spying on him with Claudius, tells her that she is like all women, dishonest. He tells her to get to a nunnery, suggesting that perhaps she needs the innocence that a nunnery might hint at. Even Laertes, at the end, when he sees her descent into madness, is despondent over the way her life ends.