I'm completely inexperienced.

I've hung out twice so far with a girl I know from my social circle at school/sports.

I can say with absolute fucking certainty that she has a crush on me, or at least did.

My problem is that I have not been escalating with her much, if at all. I like her, it's just I'm uncomfortable escalating with her. And because of that she seems to be losing interest.

At the end of our second hang out she tried giving me a hug, but I unconsciously teased her as she looked like she was doing a nazi salute, and then she stormed off pretty angry.

What do?