Wow OP. You say you're mad because he's lying to you and it's not about the $.50, which by the way is the reason for all of this. Just how the fuck old are you? Fifty cents? Seriously?
You are mad at the fact he won't give you your money, otherwise there would be no story here.
Borrows money>lies>tricks you.
He does none of this until you give him the money. And whether or not you say you're not mad because of him not giving your money back, it all started because of that... Move on man. The fact that he's still trying to be your friend means you're easily deceived. You're a fool to keep falling for it, yet you continue to let it happen. Just off yourself after you kill him. Clearly you're underage. Your mind hasn't even developed in the slightest.