I matched with a guy from my class on tinder but then he unmatched me. What does this mean?

He unmatched me in a number of minutes so no conversation had taken place. We haven't talked about it in real life, I've worked with him on an assignment but I don't really know him personally.
He's uncomfortable since we know each other
He didn't mean to swipe right
He was interested but suddenly changed his mind
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I matched with a guy from my class on tinder but then he unmatched me. What does this mean?
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