Whtat should I do when I see him?

Ok so I wrote that I liked this guy in my agenda and somehow he found out so he keeps asking to see it. I Like him and want to be more close and all but at the same time I am really nervous to tell him what he heard is true. How do I react next time he confronts me in order to get more close if I get all nervous about admitting it? Also how should I dress to look y yet not slutty when he sees me and turn him on?