Can I talk to you about my friend who I think has a crush on me?
Oh he has? Really? How exciting. What do you feel about that?
He keeps acting creepy towards me. I only think of him like a brother.
It is good to be honest with your friends about romantic situations. It is not right to keep receiving unwanted attention.
What am I supposed to tell him, he won't listen to me.
I suppose you can tell someone like an authority but they can only do so much. Maybe they can talk to him and warn him. I would give it a try even if it's a fake scenario done by a friend as a favor for you and see what happens.