"You won't forget me, Peter, will you?" Wendy asked the boy who was floating outside her window, just out of reach.
He promised that he never would and that someday soon they would go on grand adventures once more, but Wendy knew better.
He forgets everything, so why should plain Wendy Moira Angela Darling be remembered for anything other than her superbly long name. No, Peter would fly back to Neverland and go on adventures. Soon, Wendy would be nothing more than a faint glimmer, a dim star in the vast sky of Peter's mind, where space was imagination and stars were memories of things long since past.
But Wendy would never forget. She didn't forget things like he did, and she would always be empty, looking for adventures that would never come, with someone just out of sight.
Peter was sure that Wendy would forget him. He forgot things so often, in fact, that he even forgot that other people didn't do the thought that she would find adventures of her own and forget he ever existed.
They were both wrong. For a while, Wendy was still content thinking that Peter would come back to her, and Peter was content soaring above Neverland with Tinkerbell. Then things began to change. The acorn necklace which always adorned Wendy's neck began to lose its luster, and she no longer took the care in polishing it more often. The thimble which Peter carried with him always was beginning to dull as well. In fact, both items fell all but into disrepair, but their owners still did not part with them.
In time, the situation only grew darker. Tinkerbell, the only company of Peter in those dark days, had taken ill when a child stopped believing. It is a sad thing to say, but John was the first of the Darling children to stop believing, and it was in fact his utterance of the cursed phrase that sealed the poor fairy's fate.
Somewhere along the way, Wendy's spirit was broken, too, and she found that all of her happy memories now made her weep because they reminded her of Peter. Soon she found that she couldn't even make herself happy enough to get just a few inches above the ground to reach the top of the bookcase, let alone fly all the way to Neverland.
After losing Tink, Peter lost all sense of adventure, spending days, sometimes weeks alone in the old hiding place of the lost boys. Being so alone drove Peter slightly mad, most would say. Sad and alone and heartbroken, the boy would hold the thimble given to him so long ago and smile fondly. Sometimes he spoke to it as if Wendy would somehow hear what he was saying. Other times, he would sit on the tree tops and stare at the star that he had come to know as Wendy's star. The way to being talked to it, too, in the same manner as the thimble.
Unbeknownst to him, miles upon miles away, Wendy Darling still left the window open always. She sat there sometimes, starting out at the second star. Sometimes she would swear she caught a glimpse of him, but it never was. She spoke to the star as well, telling it what she would tell him, were he there with her.
Both did this very frequently, and they knew each other so well that it often sounded as though one was answering the other. Wendy knew this to be childish fancy, but Peter knew that he could hear Wendy.
Finally, after months of terrible silence, Peter packed his things and made the most terrifying decision of his life.
He was going to grow up.