How can you love someone, when they don't love you back?
Why would you think that this is in any way OK, or sane, or smart to foster and fuel these feelings?
There's a reason they're called CRUSHES. That's how you feel when you find out they don't feel the same way.
Back off, and try just actually asking him out on a date. But either way you're going to risk ****ing up the friendship. Either the potential rewards are worth it, or they're not. Make up your mind.
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."