What do you think is the main reason why a girl would not respond to a guy for days but responds really positively when sent another text?

Guy expresses romantic attraction immediately. She was attracted enough to exchange contact info and respond. She is texting back as if she likes the guy a lot, not just to be nice, like literally telling the guy that he's the only guy she's talking to right now and that he's different from the other guys she's met.
She wants to see if the guy wants her enough to message again
She wants to see if he isn't impatient/needy/crazy
She was really just so busy
There's probably another guy in the picture
She is just unsure because something seems off
She's protecting her heart just in case
She learned to play this game to keep him on his toes
Select gender and age to cast your vote:
What do you think is the main reason why a girl would not respond to a guy for days but responds really positively when sent another text?
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