I've been through this recently and to be honest, it's a really hard position to be in. It isn't silly, I've been there... just say how you feel! As long as you guys have the conversations of best friends, it's something, right? If you find yourself thinking about him a lot, tell him! Literally just tell him whatever comes to mind and whatever you're feeling, to some extent, of course. It sounds ultra cheesy but it's the best you can do in such a situation and I hope you guys work out well :)
