I should just block him should i?

i met this guy on an app 3 days ago (ik ik save me the speech but hear me out) i was looking for FRIENDS , i told him that. he kept complimenting me and we spoke on the phone for hours and he seemed not creepy. i gave it 2 days and decided to flirt back w him. and NOW he is ignoring me, says he wants to “move slow” and i didn’t do anything but return his energy… why is he being dry now?
I should just block him should i?
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