I asked out my crush, but he said no even though he likes me?

I went up to my crush and asked him if he would like to go out with me sometime and he replied, "umm... I don't think so... but thank you for asking, I appreciate it." He always stares at me and get's hard when he watches me. So, why is he saying no even though he likes me?
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I asked out my crush, but he said no even though he likes me?
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