HELP confused

this guy and I have been best friends for a while we recently started hooking up I was under the impression he really really liked me our whole friendship but he says he doesn't want to be anything more than friends because he doesn't want to ruin the friendship you know the old story well anyways lately I've been going to family functions he stays the night every night and on the phone to select people he even calls me his girlfriend yesterday after his family Barbecue he told me that his sister said we should date and I didn't have a response because I don't know what to say I want him to be my boyfriend but he says know yet does all the things that he does. WHYY?!?!?!?!? HELP