Guy said hello?

To put in context, I was at the gym and while I was heading in I turned the corner and a guy who is a regular at the gym was there and he said "hola" I think it's cuz he was brought by suprised and didn't know what to do. And I just continued and didn't say anything I felt bad.

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What does it mean was he nervous, or am I just thinking to much into it? And I don't know what to do, do I apologize for not answering next time?
Guy said hello?
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