Oh, this is so very angsty, and yet it has this kind of vein of hopefulness that comes from his connection to Jack. I love that goodbye, that kiss, and I love Jack for protecting Sawyer by making him leave. But then the fact that he makes the promise to find him, and that Sawyer believes it and that that kind of keeps him going. I love that. There's something kind of haunting about this fic that I really love. You have such a way with words. Great work :)