I remember on the commentary for that episode they said that scene was a set up for a possible Spike/Faith spin-off, but Eliza ended up getting Tru Calling (which I really liked and hate Fox for canceling when it was getting really good)

I love Spike. I didn't really like him in the beginning, but then he fell in love with Buffy... my first reaction to that was "okay, that is just stupid.", but it really grew on me and I loved their relationship and how she was carnally drawn to him and everything.