I think he should know by her wanting to make plans some other time that she wasn't just shooting him down.  He may very well have just been hoping he could mess around with someone on New Years. You can't know what he's thinking either.

I'd have to think he's not super interested but don't rule him out, and if he ends up back in your life and he seems interested, ask him if he is right away because lingering only makes it weirder when you ask later.