What do you call it when you like somebody?
A crush.

Crushes are superficial. You like the person solely because of their personality or their looks. You see what you want to see, but you never see who they really are. 

But, what is it called when you like someone, but the 'like' goes way deeper?

You genuinely care about them

You know them

You'd willingly take time out of your day to listen to them

You’d do anything to help them

You miss them when they aren't with you

And you hate them when they are

You’re there when they need you,

Yet you know none of these feelings will be reciprocated.

It's called it the Friend Zone.