So i've been dating my boyfriend for almost 8 months and I really love him and could never imagine breaking up with him. we get on so well and I am so attracted to him. But he doesn't believe that I am attracted to him, because I cannot pick out one specific part of him that I find attractive.
I suspect that you are able to tell him why you are attracted to him. It may be something small, like his smile or his laugh, the way he walks, his style of clothing, his voice, his sense of humor, his eyes, his scent, his hair, his shaved head, his tattoos, his piercings, his height, his skin complexion, his accent. I can go on and on. The point is I suspect that you can tell him specifically what you find attractive. Only you know why you are attracted to him, so tell him.