What does it mean if you ask a guy out and he says he will think about it?

i like this guy, but I don't have the nerves to go talk to he so I ask my friend to go ask him out for me , she did and he said he will think about it , when he dose he will let her know, so am so confused right now cause I don't know what his answer will be.
What does it mean if you ask a guy out and he says he will think about it?
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