desiderium - (n.) an ardent desire or longing, particularly for something once had and now missed; a feeling of grief or regret for the absence or loss of something or someone [Latin]
Ron lay on top of his covers in Shell Cottage, listening to the deep quiet; even the waves outside seemed to have stopped. He was dead tired, and he was trying to sleep, but he was starting to think that it wasn't going to happen tonight. His thoughts kept swirling, traveling back to the tent, to his friends, to that stupid locket…
He sighed and turned over on his side, staring at the opposite wall.
He was suddenly struck by the irony of his situation. That locket had convinced him, on some level, that Harry and Hermione weren't really his friends; that they were laughing at him behind their backs, that they only cared about each other, that all their years of companionship had just been a lie. And what had he done? Gone and actually smashed those friendships into smithereens. It was almost funny, except for how much it made the hole in his heart ache.
He closed his eyes, wishing more than anything that he could somehow get the two of them back.