What does she mean by saying I am "hard to read"?

Anonymous
I have been dating a girl for the past 6 weeks.

We really get along and I really like her.

I am 22, a recent college grad, and she is 20, a current college student. We live about a hour and a half away so we don't get to see each other as much as we'd like, but nonetheless I think things are going well.

The one thing that catches me off guard is that she always tells me I am "hard to read." I have no idea what she means by this. I tell her I like her, I am affectionate, etc so I don't understand it.

What does it mean when someone says you are "hard to read"?

Thanks a lot.
What does she mean by saying I am "hard to read"?
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