"Taking your word for it." And he meant it. When it came to Buffy, Spike was more likely to believe in anything that she had to say than anyone else. He'd have his questions, sure enough, but he would always be the first in line to defend her word against someone else's.
He stopped walking and turned to face her, arm folding over his chest. A grin ventured across his face as he simply said, "I would have tracked you down and rubbed the fact that you're not the only person in the world who died twice and is still kicking anymore." He shot her a smug sort of look, then rolled his eyes and shrugged, his expression slowly growing more serious. "The first thing I would have done was ask you if you really meant what you said to me back in the hellmouth." She had to know what he was talking about. Because he was certain that Buffy wouldn't just stand around and say those words to just anyone.