Not a clue!
She was sure he’d thought you just arranged to go somewhere nice with a mate and paid for the pop and crisps. And all that was very enjoyable of course, but she’d got other things planned too!
And boy was he surprised! In fact he thought a less broad-minded individual might’ve been shocked about some of the things that’d happened: some nice, some gross and all of them dead embarrassing!
But how was he supposed to know what went on on a first date? It was his first first date, after all!