Why does this guy stare at me sadly?

Anonymous
So my crush's brother looks at me all sad. I didn't do anything to him and we've only talked once like last year. My friend has caught him staring once or twice but it was not sad... But EVERYTIME i pass him he has this sad expression even if he's not looking at me, just walking past me and looking forward he looks sad but any other time he's all happy and stuff. Its super weird. The other day we looked at each other at the same time while he was talking to his friend passing me, he looked at me, kinda raised his eyebrows and just looked sad.

Even weirder all his friends have been staring at me or glancing (including his brother, the guy i like) but it isn't sad. Im just really confused. Why would he stare at me like that?
Updates
+1 y
I forgot to also add that sometimes if he's with his friends he won't even look at me, he'll look normal, thats mostly if he's in a GROUP of friends.
Why does this guy stare at me sadly?
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