Why do guys always ask if I have a bf?

as soon i meet a guy & just have one conversation with them they immediately ask if i have a boyfriend. & As soon as i say no they act all suprised & shocked. Why is it so suprising that i dont have a bf? there acting like they never met a single girl in their life before. Why do guys always ask that , & why do they care so much?
Why do guys always ask if I have a bf?
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