What does it mean when guys just let the conversation drop?

Sometimes when I text my crush, we have a pretty good conversation. Then I say something that isn't too interesting, and he doesn't text back after that.

If he liked me back, would he try and revive the conversation? Or would anyone just let it drop at that point, without saying good-bye or anything?

(For the record: when we're together he's pretty flirty, but when we're texting he really isn't.)
What does it mean when guys just let the conversation drop?
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