What does it mean if a guy doesn’t reply my texts?

So, I have been crushing on this boy, I feel like he’s perfect. He’s everything I’ve always wanted.

He has given me signs of interest, for example his friends tease him and he blushes when he hears my name. But he never replies and the other day when I ran into him he tried to ignore me. Some of his friends say he is REALLY SHY but I am still confused. Opinions?