I like him, but does he like me?

He sit's by me, hits me back when i hit him. Walks with me, always talks to me. I stay up all night texting him. We talk ALOT. He sits with me in homeroom and at lunch? He always laughs and smiles when hes around? I am not gonna tell I like him because my friend asked him out yesterday and he said Yes, but me and the girl are good friends and we all hang out? It's killing me inside!