There's this really cute girl I've been seeing almost daily at the library as we sit in the same zone.

Months ago I decided to approach her, introduced myself, talked a bit and (wrongfully) asked for her number which she didn't gave me because she was not "into seeing people at the moment".

Time has passed, after this first approach I got a little bit "scared" of her but we still salute each other often.

What I noticed though is when we salute she often has a disappointed face.

Does it mean she is expecting some more from me or is she kinda disgusted by me and just wants me to go away?

How should I read the situation?