"Oh, right. And this is obviously one of those things that just came to you?" Obviously she hadn't really believed him that he had other things to do. She knew he wouldn't have broken anything off just to hang out with her on the subway. That would be silly. Very silly. Borderline stupid of him. She wouldn't have done it for him, had the roles been reversed, and she'd had something else going on.
"I figured you didn't cancel anything just to spend time with me. You don't seem like that type."