Why does he keep staring at me with sad eyes?

Anonymous
Lately I've been noticing a guy friend look at me with sad eyes. Whenever I speak to him he's fine and we always have our inside jokes and stuff.
Its just that I've noticed a few times in the corner of my eye I see him sort of staring/studying me with, what seems like, sad eyes?
Why does he keep staring at me with sad eyes?
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