How do I break up with him, without ruining our friendship?!?

Me and my boyfriend have been friends for over two years now. On the weekend of the 21st back in May, he asked me to be his girlfriend because he had a HUGE crush on me. I THOUGHT I had feelings for him as well. I was excited everyday to see him. But since we've become girlfriend/boyfriend its different. Before we became a "couple" we were like bestfriends. Now, i feel like i'm closer to him but at the same time, father from him. The problem is, he loves me, but i don't have that strong of feelings for him. Truth is, I have just realized that I am inlove with one of my other bestfriends. I want to break up with my boyfriend because I don't think its fair to him, to have a girlfriend who is inlove with someone else. But how do I let him down gently. I definately want to stay close friends with him because he is a nice person, and i do like him and care about it. I DONT WANNA HURT HIM! That's why i'm asking this question! I don't know how to tell him that we should break up, without killing him because he is like... head over heals. Another issue with our relationship is he can be kind of annoying... He annoys everyone, including me sometimes. He never annoyed me before we were gf and bf, so why is he now? And my parents don't like the idea of us going out, A because they don't want me going out at all, and B because they think he's to tough and I could do better. I also think that we should take a break because he can get sooooo emotional, its crazy... I just want to take a break. Maybe in the future, we could get back together. But for now, i think we should... break up. HOW DO I TELL HIM WITHOUT HURTING HIM?! Any tips? :(