Most Helpful Guy
How do you know you're not his type?
You may not be his type, but he could still have a crush on you. I've liked girls, or had crushes on girls, who I never thought were my type. Heck most of my life I was more into redheads and brunettes and wasn't into blondes. My GF of a few years now is a blonde. She wasn't my 'type' but I fell for her regardless.
Not sure if those are surefire signs you mention, but they are signs he may be into you. I used to act like that around girls I liked. Test it out maybe, talk to him a bit, see how he is when you both talk. Try flirting with him subtly and see how he reacts. If you see he does like you maybe try making the first most.
If you like him and just want to know, just ask him out. Sometime's it's better to know how he feels than to ask 'what if'. Plus if you ask him out he may consider it even if he didn't have a crush on you.
Most Helpful Girl
Ask him if he does.