All Jack had wanted for Christmas was to be believed in.
For someone,
Anyone,
To believe in him, so that they knew it was him that brought the snow, and the fun along with it.
But since being on the Naughty List meant no gifts, Jack never got what he wanted.
For 300 years, every Christmas, he wished for a believer, someone to finally be able to see him.
And for 300 years, he never got what he wanted.