Demon makes Spike feel Worthless

Hello. I'm looking for a fic in which Buffy doesn't jump at the end of season 5 but Dawn get hurt anyway. Spike blames himself although no one else does. I remember that there was a demon that fed off that feeling to make him feel worse. I think at the showdown, Spike becomes frozen at one point.
Does this ring any bells?
Thanks

Found it! Atonement by Katrina.

SYNOPSIS: B/S Fic. Answer to a challenge number 8 on Kantayra's site. Buffy doesn't die at the end of S5's, The Gift, but Spike feels he's completely failed as Dawn is hurt. Just as Buffy discovers her newfound feelings for the vampire, he distances himself from the Scoobies because he feels unworthy. Will Buffy be able to prove him wrong or will the new Evil in town prove him right?

Yes! Thank you!