He might know that you would not stay.

He wouldn't want you to stay.

I can't understand--unless," her voice became crisp with sudden enlightenment, "unless you were foolish enough to pay in advance! Surely you did not do that ?" The professor was observing his boots in an abstracted way.
"I am afraid my feet are very wet," he remarked.
"They are.

They are resting in at least an inch of water," she said coldly.

"But that isn't answering my question.