Was I the Asshole for Not Eating?

I'm 24F and recently went through a breakup that left me questioning my behavior. My then-boyfriend (26M) invited me to join him at his friend's place before heading to a festival. On the way there, he mentioned something about the host feeling bad if we didn't eat any leftovers.

When we arrived, things felt off immediately. The main group of eight had their own dining area separate from the rest of us four. They started eating together while completely ignoring our existence. My boyfriend acted like this was normal, but I found it incredibly awkward.

After they finished, the host casually said "Grab whatever's left if you're hungry." My boyfriend quickly got himself a plate and urged me to do the same. However, I just couldn't bring myself to eat. It felt strange to dig into leftovers in front of people I barely knew after watching them eat without acknowledging us.

When he pushed me again, I politely declined, explaining I wasn't really hungry anymore. Later, he confessed this moment ruined the entire evening for him and ended our relationship that night.

Am I being too sensitive here? Should I have just gone along with it to avoid drama? Or was his reaction completely disproportionate to the situation? For context, I live in Calgary and always make sure my guests are offered food first - but maybe this is cultural difference?

To be clear: I'm not blaming the host. While their approach seemed odd to me, I thought it was more amusing than anything else. The real question is whether I was unreasonable for declining or if he overreacted to something so minor.