Why do guys do this?

we've been on 1 date and it was great we text all the time send pics talk on phone etc. he asked me out again and i said yes. so yesterday i asked him if we were still on just to make sure and i haven't heard from him and it was planned for tonight. there was no time set so i dont onow what to do. he hasn't responded to my text, which never happens. so im just really confused. should i just leave it?
Why do guys do this?
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