Ew! Fat guy asked me out today, why?

me and this guy are friends i mean i wouldn't consider him even a good friend, but today he asked me out. he's a nice guy and he's good to talk to but he's not really dating material, he's fat! the thing is as much as he wasn't a close friend he was a good listener so how can i reject him but not loose his friendship?

im 5 foot 7 and a skinny build with green eyes and blonde hair so i know i can do better
Ew! Fat guy asked me out today, why?
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