I would be inclined to go out with him again in the name of research, just to see what he does at an outdoor cafe when the OP orders a big meal for herself.
Yes, research only! For the benefit of e-hellions. But one more sign of behaviour like that and he's out!! And yes, ask him what was up with the popcorn.
As I was reading the OP, my thought was "I'd never go out with him again." However, I do understand what it's like to be fooled by the quick switch back to Nice Guy. I had one of those; it didn't turn out well. The Nice Guy I dated really did seem nice for a few weeks and suddenly he had an outburst over nothing, that took me by surprise. Then he was back to apologetic Nice Guy. This became an increasingly frequent pattern. And yes, he frequently commented on my food intake or told me I shouldn't eat certain things. I was fit and trim at the time, as if that should make any difference. I don't know why I put up with him so long but the last time I saw him, I was at his place about to tell him I was done with him, when a girl I didn't know knocked on the door. He invited her in and they sat and chatted about people I didn't know for ages, ignoring me while I sat there twiddling my thumbs getting tired and wishing she'd leave so I could complete my breakup. (Also very rude behaviour on his part, but I believe he was trying to make me jealous). I finally got up to leave, and broke up with him later by phone.
Sorry for the digression. But he really did have food issues, ie issues about what *I* ate. I'd be telling him a story that might involve, "I went to the grocery store to buy ice cream, and......" (meaning to continue with an interesting story about buying ice cream) and he wouldn't even let me finish my story without interrupting, "If you buy that stuff you're going to get SO FAT."
Seems it's not all that uncommon for control-freaky guys to use food to control.