He hasn't texted me all day?

We've been texting and flirting back and forth for 2-3 weeks now. At the beginning I was initiating but recently it became like 50-50 to maybe 60-40 where he maybe initiates slightly more (although it's hard to tell because we basically had a slow conversation going for days and we change topics and stuff)

About three days ago we agreed that we should date (although, who knows what that means, because we're temporarily long-distance) and the flirtyness has gone up even more.

But he suddenly stopped texting me about 24 hours ago! He has read my message but then nothing. Do guys change their minds that fast? What should I do?
He hasn't texted me all day?
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