Why won't a guy tell me if he has a girlfriend?

I got my crush's phone number and texting him anon like, he does not know its me. Asking if he has a girlfriend. and he's being super evasive. he won't say yes or no. Why? I'm trying to find out straight from him if I'm wasting my time crushing on him.

Why won't a guy tell me if he has a girlfriend?
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