Is My Teacher Crushing on Me?

I'm 19F and in my final year of high school. On and off for the past 6 months this 22M year old college student has been doing teaching placement in my english class. Me and him have really good platonic banter and a lot common. Anytime we pass each other in the hallway we stop and have a chat, and he stopped trying to tutor to me after class because we wouldn't study and just end up joking around. He's never touched me, asked any personal questions and has never asked for my social media. So I simply thought of him as just being "the fun and easy going type teacher" or even like an older brother since he's only 3 years older than me. We ran into each other at the city and ended up chatting for a few hours at a cafe. We playfully kicked each other under the tabel a couple of times and brushed shoulders a couple times as we walked back. Before he left I casually asked him what his type was and he winked at me and said annoying and then left. Something he always calls me.

Is this going to be the start of him grooming me? Or is he genuinely interested in me? Or am I over thinking all this? What should I do? I'd be lying if I said I wasn't developing a crush on him.