I've known this guy my whole life and...?(Guys and Girls)?

His name is Josiah and he's really cute, smart, funny, nice, and an artist. He has a band named Sirensong and a girlfriend but I don't think it'll last. I've known him my whole life (literally, he's a year older than I am and his mom and my mom were friends since high school so that's how I know him) and recently I've realized that I'm in love with him. About a year ago we started talking on Facebook and I started it because we had been losing touch. I didn't want that to happen because he's one of my best friend's even though I don't get to see him much since I moved and hour and a half away from him. We started getting close again, and soon after that closer than we were before. Then we started losing touch again because he got a girlfriend and wasn't on facebook as often anymore. About a month or two ago I saw him and it was a surprise because we were at a women's banquet for my church. Turned out he was leading worship with his mom. I had missed him so much and we hung out the entire time. When it was over on the way home I missed him even more. It felt as if a wound had finally healed when I saw him and then I left and it was ripped open again. I realized that I love him. Last time i saw him was at his older sister's graduation party and I felt the same way as before. What do I do? Right now I can't be with or without him. And I can't tell him because if he doesn't feel the same way I'll lose him and I can't let that happen. I care for him to much. Every time I've told a guy that I liked him it ruined our friendship . They always ended up hating me or feeling awkward whenever I'm around. I couldn't stand it if that happened with Josiah. Also in the past few days I've been literally dreaming of him. We'd see each other hug, hang out, and talk which was pretty much what happened at the women's banquet. Then I always had to leave and it's happened twice. I miss him even more when I wake up from those dreams. Guys, what do you think would happen if you were Josiah? (If he broke up with his girlfriend and we started hanging out again.)