I accidentally ignored the guy I like, what do I do?

Pocahontas2000
I was talking to my friends, telling them a story using my hands, when I raised my hand to demonstrate something to my friends, that guy passed by me and he thought I waved him a hand, so he raised his hand and smiled happily, I however was so involved in talking that guessed it a but later and didn't wave him back but continued talking to my friends.

He didn't show up that day after that. My friend says I hurt his pride or something.
I accidentally ignored the guy I like, what do I do?
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