Guy doesn't even seem mad, but won't initiate anymore after I told him I only liked him as a friend. Why?

Anonymous
Basically, a few months ago I went on a few dates with a guy from my college and during our last date he ended up telling me ''he really liked me'' after walking me home from a restaurant. Don't get me wrong, he's a fun and charming guy, but I told him I only saw him as a friend... to which he didn't even flinch. Not only that, an hour later I received a text from him that said ''Thank you for today''. To which I replied I was happy we got to hang out.
That was it. Not a single text from him since then. Not a single attempt to initiate. When I text him he's acting the same way as before.
Did I miss on a great person with whom I could have spent my life with?
Guy doesn't even seem mad, but won't initiate anymore after I told him I only liked him as a friend. Why?
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