"But if she could not tell him things, there was still the obligation to admit to herself, everything."
I love this! Buffy has always been so willing to downplay or outright ignore her actions in their past relationship. Her facing up to everything is just shocking.
"These other dimensions, the physical laws there, they're different. If Spike stared into something his brain couldn't handle, that could explain the psychosis, and the forgetting. Right now, that's my best guess for what happened to him."
This is scary. Now I wonder if Spike will ever get his memories back.