OK, help me please. I totally am confused in signs weather he likes me or not. This morning we said Hi to each other and there was so warm and prolonged eye contact (we just couldn't take eyes from each other), I just almost died lol. But then the next thing he does during day, ignores me completely, doesn't look at me when passes me, just now he passed me with his friends and he kinda hide between them, his head was very low towards the floor, and arms crossed, but when I was out of scope his head quickly moved up.
As someone else said he's most likely a shy guy. I suggest you try and talk to him when he's alone and see what comes out of that, give him a little compliment or whatever and see how he reacts. That should tell you enough.
This is just my opinion. What if maybe this situation was misunderstood, and he feels a bit akward? Its average for a person to make eye contact (no pun intended) with greets or hellos. And did you have a thing for him before? If so, you couldve misconstrued this situation easily.