Why does he do this?? can u help?

well i like his guy and his name is alex .S. he likes me and tells me he loves me but then he goes off tellin me ti shut up and that he dosent even know me any more. i like him alot but i dont know how to show him and i tink hes just messin wit my brain cause hes in my band. but i dono f i will evr have a chance with him..... do you think you could help me? he makes me laugh and hes a really great guy its just i dono if he really does love me.. are there things to look for like mabey signs or any ideas on how i coould tell him! if you can help me i would really like it!