Why would he say "see you soon"?

If you hooked up with someone one night and then the next day went your separate ways without exchanging phone numbers, why would the guy say "see you soon"? It was a guy in fraternity I hooked up with and there are big chances of me seeing him again because of the whole frat/sorority community at my school but if he didn't want it to be just a one night stand why wouldn't he ask for my number? Do you think he just said see you soon for no reason or do you think he would try to hook up with me again?

signed, over analyzing female lol
Why would he say "see you soon"?
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