It means that the other guy who has your number now probably likes you but just didn't feel like asking you for it or the guy who gave your number away is trying to show off.
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It is usually after you give him your number. Can he reach you later?
it means that the guy was to busy with another girl but didnt wanna be rude.
Kiss him.
He likes you.
Maybe. Or, he's lazy. Or, he doesn't know how to respond. Assuming won't get you anywhere. Trying sending him another when you feel ready.