It all began at the end of his fifth year. But it was expected. It had been manifesting since the past year. Since the return of Voldemort, and the death of Cedric. Harry, as usual, blamed himself. He began to fall into seclusion, not talking to anyone, going about his studies quietly. No one could help him.
Harry walked into the common room after Potions, carrying his books. He walked up to his room – he had managed to persuade Dumbledore to give him his own room – and put his books back into his trunk. He pulled another book out of his trunk and lay down on his bed, opening to a certain page.
After a while, he looked at the time, and found that he had missed dinner. Again. He walked down into the common room.
"Harry!" he heard someone call, but he ignored them, "Harry!" He just walked out of the common room and down to the kitchens. On the way he passed Ron and Hermione.
"Harry!"
"Harry, mate."
Again, he ignored them, continuing walking down to the kitchens, all the while hoping that he wouldn't be served by Dobby. He wasn't in the mood for the elf's cheerfulness. Sometimes he wished he'd never freed him, even if he was working for the Malfoys.
"Potter," Harry heard someone say, breaking him out of his thoughts, "What you doing down here, Potter?"
Harry brushed past him and continued down to the kitchens. Malfoy looked at him, confused.
"Hey, Pot… Harry, are you ok?"
Harry, just like with the other three people, ignored him, and kept walking down to the kitchens. When he finally got to the kitchens, he tickled the pear and turned the handle, walking in. Winky appeared in front of him, eyes bloodshot and traces of tears on her cheeks.
"Can Winky get you anything, Mister Potter?"
"Just a pumpkin pasty, Winky."
"Right away, Mister Potter."
Harry liked Winky. She didn't ask many questions, and in a way, he could relate to her. He had lost his godfather, and it was his fault that Cedric had died. She had been given clothes by her previous master, Barty Crouch at the Quidditch World Cup.
"Here you are, Mister Potter," Winky said, putting the pumpkin pasty on the table in front of him.
"Thanks, Winky," he said, picking up the pasty and biting into it. Winky bowed and disappeared with a crack.
When Harry walked out of the kitchens, he ran into Fred and George.
"Hiya Harry," they said in unison.
Harry gave a small smile, though it didn't reach his eyes, and walked back up to the common room.
When he got there, Ginny, Hermione and Ron surrounded him, Ron hiding the map behind his back.
"Harry. We need to talk," Hermione said, calmly but seriously.
"Where'd you get that?!" Harry growled at Ron, angrily. Ron yelped, shaking his head and pointing at Hermione.
Harry pulled out his wand and pointed it in Hermione's face, snatching the map off Ron.
"What do you think you're doing?!" Ginny yelled at him, "She's trying to help! As are me and Ron!"
"I don't need your help!" Harry yelled, and started to storm past them, up to his room.
"Harry," Hermione said, weakly, putting her hand on his shoulder. He looked at her for a second. Her eyes were brimming with tears. He then shrugged her hand off and continued up to his room.
When he got up to his room, he opened a secret compartment in his trunk – he had inherited this trunk from his mother, and it had lots of compartments, half secret – and said 'mischief managed' and put it in, closing it afterwards. He lied down on his bed and fell asleep eventually.
~2 hours later~
Harry woke up and walked down to the common room. It was deserted, though the fire was still crackling. He went and sat on the couch in front of it, staring into the flames.
"Harry?" he heard someone from the shadows say uncertainly. He turned around, and saw Luna standing there.
"Luna," he said, before turning back and facing the fire.
"Are you ok, Harry? Everyone's worried about you," Luna said, her normal dreamy voice now serious and concerned.
"I'm fine, Luna," Harry said, looking into the flames intently. It almost seemed as if he was hoping Sirius would floo-call.
"I'm sorry Harry, but I don't believe you," Luna said, coming down and sitting next to him.
"How'd you get in here anyway, Luna?"
"I have my ways. Now, tell me how you really are."
"I told you. I'm fine. Seriously," he said, looking around, "How did you get in here?"
"I'll tell you, if you tell me why you're falling into seclusion."
"I am not!" Harry said, defensively.
"Denial is a sign that it's true."
"I'm not, Luna, and I'd very much appreciate if you'd leave me alone about it."
"Ok Harry," Luna said, thoughtfully, "I'll leave you alone, then."
She walked out, seemingly hurt, though Harry was completely indifferent to this, staring into the fire still.