I said hello and he ignored me?

OK so I thought it would be a good time to say hello since I've been trying to be more friendly and i've noticed we both make a lot of eye contact, I was standing on the wall and he was walking straight past me, I said hey nonchalantly and proud, he turned his head to the side slowly to look at me then turned back around and continued walking by with kinda a serious/mean expression as always. Did I do something wrong? Does this mean he doesn't like me? Should I ignore him when he stares next time.
I said hello and he ignored me?
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