[He means more that she's expecting people to look for her in the first place...but this settles things neatly into place in his mind. This girl is that girl, on top of being spooky girl. He's not too impressed with her choices...]

I could just always be up this fucking late. [...It's pretty dang obvious that's not the case, and he hardly puts effort into the lie.] Just dumb shit. It's not worth getting into. [If it was, that might imply anything about him is worth getting into, which would be ridiculous.] Always fucking stops eventually...