[Being trusted is something that's a bit new to Spike. Buffy trusted him with some things, they all did, but they weren't going to confide secrets in him. It's a fair response, it's not like he hadn't already betrayed them. But it's nice, all the same.

And he meant it. He won't betray her for anything in the world. Even Buffy.]

Oh, that's really interesting. Seems like we've got the macguffin then... You did good.

[Hmmmm... He's a bit unsure how much]

What is it? You allowed to tell me that much?