Why this guy stares/ignores me at the same time!? Please help!

Anonymous
In school, I have noticed this guy always taking a glance at me, his eyes follows my actions, my friends told me whenever I do something he´s paying attention. He is usually very quiet around me, seems like over-listening the conversation with my friends.

If our eyes meet from far away, he holds eye contact! We just stare at each other about 3-5 seconds.

but if we are close to each other, then he ignores me like I do not exist.

OK so I have noticed him doing it for 2 months now. First, He noticed me and took a glance me but ignored me if he sit next to me in the library (still come to sit next to me? LOL)

Then I met him at the music concert in very crowded bar. (It was a month ago, I thought it was a good chance to break ice between us, he was drunken) he was standing next to me whole time, hit his body to me! Also dancing behind me very close! But never tried to talk to me. So I looked at his face several times! Finally when he looked at me back I was smiling but he was not! Stop dancing, just frozen! It was awkward THEN when I was moving out from dance floor he held my hand for 5-6 seconds.

After this happening, he stares me EVEN more from far away! If our eyes meet he stares at me for 3-5 seconds, But still if I´m very near him he ignores me!

For example Today I was sitting in the library, when I stood up! Then I saw him also standing! We both stood up to go out, We just stared at each other, then both of us were walking to the same door .He opened door and I was just behind him. But he did not open for me.

He just went out ...Anyone can hold the door for next person, I do it all the time. He was acting like I´m not even exist.

Why? Then he was taking a glance at me AGAIN at the cafeteria :(
Why this guy stares/ignores me at the same time!? Please help!
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