Dreaded fic search

I know, I know, yet another fic search, but I've raiding my head and I can't remember where I read this one. 

I remember that it was somewhere on season 5, I think. Spike was in love with Buffy, but she didn't want him. Spike, furious, decided to take revenge, and he pointed on Xander's direction. He used Xander, then something happened (I don't remember what) and they weren't together anymore. So Spike decided to woo Xander, and they went out on dates and everything.

Sorry for the vagueness, could anyone help? Thank you all in advance.

Edit: It's been found. It's Sweet Revenge, by Jackson. Has been found by angelicvampyre, who I owe a great thanks.