I don't know you, nor have I ever even had any romantic relationships, but if I were in your situation, I would tell him I would like to talk to him privately. When I am, I would say I have feelings for him, and why I have them. I would tell him I'm interested in starting a relationship.
If he said( in a nice, polite way) that he doesn't feel the same, I would be hurt-
but I would tell him it's okay. I would ask if we could stay as friends, and thank him for being polite.
-If he wasn't nice about it, I would tell myself I'm better off and he doesn't deserve me.
If he said he does have feelings for me and he does want a relationship, I would smile, hug him, thank him and see where we go from there.

Wow, that took a while. But I'd like to offer what I can to who I can.
Wish you the best!