Well since you never know if the wayback will work. Here is another link to that fic.
It's one of my faves.
http://www.nocturnal-light.net/fanfiction/story/411/Blast_from_the_PastI found this fic that sort of fits. Spike doesn't try not to love Buffy and it's not exactly that she is mean to him intentionally. That is the same in Blast From The Past too.
It's just one shot but pretty good length.
Blind Date by lucky021
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=8547Summary: William was in love with Buffy in high school, but she completely dismissed him. 6 years later their friends set them up on a blind date for Valentine's Day.
Black by TestaALT
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=23446I remember this one and I hate it will probably forever WIP and doesn't even end at a good place

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Well since this is part of what you are looking for and there is some Spuffy. I thought I would post it. There are 27 chapters.
Summary: *Updated!* Buffy has picked on Spike for years of high school, blackening his very existence and making life hell. The skittish little guy just takes everything she throws at him and bottles it up. He has, amazingly, found love for her, despite her harassment and valley girl persona. But when Spike's parents split, he decides to make a few changes, one of which includes having her. All human; set in high school; really angsty at times.