The truth is far better than a lie. Pretending would provide comfort for him, but in turn, would feed the delusion. Right now, he doesn't know how to feel about it. He still feels so very lost, like his drowning. Nothing makes sense at all and he needs things to make sense. He's a scientist through and through and he needs to make logic out of the illogical.

"I- I've spoken to Sailor Moon about trying to rest but that was...really early on."

At least, even in the midst of his delusions, he remembers not to out his friend. He doesn't say Usagi. He promised he would never divulge her secret identity and he will keep that until the end of time, madness or not.

"...Maybe I can try again? I don't-" he's scared he'll make HER corruption worse, he's already done that once. "I don't know if it would do anything. But...but maybe?"