Act two scene one was just a bunch more of crazy Hamlet. In this scene their is a particular part in which Hamlet and Ophelia interact and Hamlet seems to act a little crazy. He grabs her and said nothing the whole time then suddenly leaves. shakespear hasn't really explained what that whole thing was for but i guess we can make some predictions. I personally think he wanted to desperately tell her about his father and what had happened. He needed someone to confide in but he couldn't tell her. She was too weak and would tell her father and everyone would think he was crazy. Another alternative is perhaps he really did just love her so much but he realized he could not have her. I really hope this gets answered in later parts. We'll just have to wait and see.