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Nostrils flaring up usually means something is causing him to breath heavier. It can also mean that something is causing him to react strongly to something. This could mean things like anger, or it could mean he's nervous, but yes it can also mean he digs you.
Just ask him out or something if you want him to date you. You don't need to wait for him. Talk to him and tell him how you feel about him. Ask him out. See if he digs you. Whatever. just go for it. Have fun.
It means you smell bad. Duh?
Means he likes you back and gets nervous around you :)