Is this a red flag or am I overreacting?

Some old classmate (I knew) told me he had been interested in me for a long time. We used to go to the same school when I was younger.
He asked me out and I went on a date with him. Long story short after the date he took me back home and we were making out in his car.
Things got hot and heavy afterwards, I told him that we are moving too fast so could we slow it down and he said it was okay. He hugged me and said it was fine and we just stood there hugging each other.
What he didn’t know was that I could see his face from the reflection of the window of my place through his car. (If that makes sense) And he was making faces as well as putting his hands near me pretending to choke me out, thinking that I can’t see him.
I felt very weirded out by those actions. I didn’t address it because again it was very weird.
And since then it’s been about a week and I haven’t answered any of his calls (he left 20 missed calls) or text messages.

I just want to ask, am I reading to much into this? Am I overreacting? Should I call him back and apologise? I’m confused.