The guy I like doesn't talk to me anymore. I don't know what happened. We bump into each other yesterday and we didn't even say hi (but he greeted my friend). But my other friend said that he looked at me. Then we went to some place with our friends. But still he didn't talk to me. But I saw him looked at our direction(maybe he looked at my friend, not me)

But what could be wrong with him? He isn't like that. He is never like that.

You realize you are allowed to have the first word right? You don't need to wait for him to initiate anything.

He's probably feeling the same way. He's also probably wondering why you didn't say hi to him.

LOL, so why didn't you say HI?

I'm a guy and that's what I do to a girl I like, we walk past but I'm just too scared to look her in the eye simply because of shyness, even though about a year before we always talked and smiled at each other

I'm not an expert on this sort of stuff, but his personality is just changing and he grows evermore shy towards you, that's what I've done

I think that you've got to make the move