i need help he's very important to me....

Well, I think あなた need to tell him that though あなた care for him, it's as a bf, not love. I've been through this and know us guys don't enjoy hearing can we be just friends. I can tell あなた that we do get over it.
I would suggest that あなた find a way to talk with him and tell him how あなた feel. I know it will be hard for あなた because あなた don't want to hurt him. Just remember, the longer あなた wait to talk to him, the harder it will be on you. Also waiting to tell him might give him the idea that あなた have the same feelings that he does.
Just relax and tell him as kindly as possible. There might be an short awkward period while he adjusts. But since あなた have been good フレンズ for a while, he should come around. I hope this helps. I know it seems hard, but it's part of growing up. Good luck and God bless.