How do I respond to a dinner invitation?

This guy is very handsome, he’s an actor here, and is really extremely good looking, he’s so handsome that I feel shy, we’ve met before and we clicked really well. But that time I was just thinking about having fun, didn’t even consider he’d like me that much, so I didn’t really show any interest. I was just being friendly.

However, We’ve spent the whole evening together, talked for hours, danced and we even kissed in the end.

He now asks me out on a dinner, I feel so nervous, haven’t even replied - yes. I don’t want to sound too excited but also not too confident.

How to say yes to sound confident but also not show how excited I am?

How do I respond to a dinner invitation?
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