Why do girls give your their number without you asking just to not text back or text back late?

My dating struggles basically this is usually how it goes ok-great conversation she flirts I flirt a little or just be cooling she gives me her number I don’t ask for it I text her 5 messages later literally 5(3 from me 2 from her) she either starts replying extra slow like hours to days or no reply at all

Your just boring
It’s them Not you
y'all both on the spectrum
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Why do girls give your their number without you asking just to not text back or text back late?
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