Being a man, I would say just go up to him and tell him how you feel. There is nothing I hate more than a guessing game. Just put it all out there, and you will get a response, even if it isn't one you want. Holding that in just makes things worse later on for you, and him. I like it when a girl comes to me to tell me she wants me. Even if im not interested in that girl, i admire that.