Confessed my feelings. It went terribly wrong

For context, we’re both 23 and live in Paris. We met through one of our university courses this semester and have hung out one-on-one three times. Friday was the third time.

I’ve actually had a crush on him since before our first one-on-one hangout. During that first hangout, I felt like there was some flirting from his side, but after that our dynamic felt mostly like a friendship. I still developed feelings, though.

At the end of fridays hangout, as we hugged goodbye, I told him I’d had a crush on him for the past two and a half months. I also told him there was no pressure because I’m moving to Brussels at the end of the month until December (I’ll be back in Paris in January), while he’ll stay in Paris. I even joked that I’m an adult and can handle rejection.

He smiled, looked genuinely flattered, said “aww,” and then hugged me again. But he didn’t really say anything else.
It’s now been three days, and he hasn’t texted or called.

I’m trying not to overthink it, but obviously I am. From a guy’s perspective, if you were in his situation, what might be going through your head? Would you be taking time to process, or would silence for three days usually mean you’re not interested? And if you were interested but surprised, would you eventually reach out?
I’d really appreciate honest opinions, even if they’re not what I want to hear.