Thank you.

That's a natural consequence of Harry going so fully into his training, I think. He's focused on the idea that no one can really help him, because the prophecy says that he has to face Voldemort alone, and so that translates into not letting people help him in other areas of his life. I've tried to show (without openly stating it, because Harry is not that self-aware) how much Dumbledore's announcement of the prophecy affected him. I'm not sure I've always succeeded.