Does Hamlet Really Love Ophelia in Act 1-3?

I think Hamlet might have been interested in Ophelia in the beginning but nothing more. If he really loved her he wouldn't have been able to get over her so fast...unless he's a heartless butthead. Maybe he just wanted her body and knew what he had to say to get it. Why would he send her letters saying he loves her and then tell her she's a whore. Like in line 122 in 3.1, "Go thee to a nunnery." He's just crazy.