definitely do not do anything stupid like confessing this to him. It'll be way too surprising and disturbing - maybe taking weeks for him to recover even so much as returning speaking levels.

Instead, try to flirt. Horrible advice, if I say so myself - I have a lot of difficulty with it - but its the only method suitable to not getting rejected. In my opinion, flirting means to talk/joke about light subjects in which you say or imply positive things related the other person. For example, you could laugh out and say its so funny how his nose twitches when he talks, as if you just realised it then and there. Smile at the same time so he knows you're not laughing about him. See what his reaction is.

Obviously don't say things that are not true. His nose really does have to twitch, and you'd better like it. If you do that, the feeling you have while you're with him will help to make it sound like a compliment. Maybe other people here could help a hand and submit some flirting techniques? I'd be interested too!

BTW, guys can be real blockheads. Its very well possible that after you tried your flirting, he lies in bed late at night and only then realizes that maybe your odd behaviour could be interpreted as some move by you. Therefore, his reaction may be delayed by a few days.

good luck