What does it mean when a guy doesn't say hi when we meet but only stares with a serious face?

alina18
We meet very often.he took me out for a movie with my younger sibling.Acts in gentlemanly way(opens the door).He never says 'hi'but only looks at me alot.indirectly asks me if I have a boyfriend through my close ones. He rarely talks but shows signals by liking my interests.if he likes me why doesn't he talk or at least say 'hi' when we meet.He always showsoff how smart in front of me and also talks about impressing other girls when I am near.what is this guy's aim?
What does it mean when a guy doesn't say hi when we meet but only stares with a serious face?
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