I accidentally rejected a guy... what should I do?

So this guy asked me for a drink the other day and I said "No I'm ok, thanks."... because I thought he might have been inviting me to go with some other guys and I have anxiety.

But now I'm not sure if he actually meant it was 1-on-1. Do you think he was interested in me and if he was did I screw up? What do I do? After he asked me I started thinking about him and realize he is cute and I like him...
I accidentally rejected a guy... what should I do?
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