Just friends????????????????

Ok. so theres this boy that i have know for a reallyyyy long time. We have been friends [more like brother and sister] since we were little. we had sleepovers all the time but now that we r getting older, its different. i like him a lot and some of my friends know tht i do but whenever they tell him that i like him he always says ewww gross so i deny it. but hes always around and fought with a kid that was flirting with me. does he think that we r just friends? will we always be just friends?