The guy I like usually texts back right away, but today he has not replied?

There is this guy I have crush on, it seems like his interested, I can see some signs, and he wants to spend time with me, and we are suppose to study together this Tuesday, I saw him today and I text him later, but he has not replied.. Does that mean his not interested? What's up with his behavior? He sometimes text back right away, but he did not today, does that mean he lost interest?
The guy I like usually texts back right away, but today he has not replied?
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