Confusing felling. please help. is this normal?

There is a guy who i have been friends with 8 years, and for most of those 8 years i have had more feelings for him than just friends. my friend thinks he can be an *** sometimes, but i dont really see it, because i really like him, maybe love. over the course of these years ive known he has had the same feelings for me at times, but we didnt pursue anything because we were to young, or didnt want to ruin our friendship. I dont really know why i feel so strongly about him, but over a school trip this past week my feelings have gotten EXTREMELY stronger and im freaking out, because i dont think he'll ever like me back, and i have another friends who doesnt know i like him, and she is wanting to date him. im starting to actually dislike this friend just because im confused and worried about my feelings about him. hes one of my best friends and i dont know if i want to tell him about my feelings and im so confused and im going phyco. i have no idea what to do right now and i need some advice from people who dont know either of us.. please