Most Helpful Girl
well, this kind of physical contact (touching a guys face) to me is pretty flirty, I mean, I don't touch my guy friend's nose or anyone's for that matter (except my bf).
so it might be sign that she is comfortable around you (enough to break a very strong physical touch barrier). thou you must be careful, if she only did it once it might not be that important, but if she does it constantly she might be flirting. :) good luck
Most Helpful Guy
Dude same thing happened to me the other night. When I got to the bar she have me a long kiss on the cheek which she has never done then she stroked my face with her whole hand. We are best friends so I'm in the same boat as you. I don't want to make a move because what if I'm wrong about her liking me and then it gets awkward. I feel like me waiting for her to make the first move eventually will work.