Guys, why would you give a girl your number and not respond?

So I reconnected with someone I went to high school with. He actually initiated contact by giving me his phone number. I did initiate meeting up, which didn’t happen since he says he is busy. (That I do believe) We started texting and he would delay answering (so would I) and I sent the last message to no reply. I’m not sure if I should leave it alone or ask about meeting up again. I was wondering why give me his number to stop completely stop responding?

Also, we follow each other on social media so he is active.

Any advice on what I should do

Guys, why would you give a girl your number and not respond?
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