<human>: I'm 25 and male, shes 24.

So, there's a girl I know who initiates a lot of physical contact with me, and its not the typical stuff like shoulder grabbing, and hugs (though we do hug) I'm talking more about stuff like shoulder nuzzling (Like a cat) and more extroverted physical displays in the same vein. 

She's also got a tougher exterior, and asking her best friend (who I've known 5 years longer) about it, she doesn't really open up with people. She exposed her vulnerable side to me, which I found fairly endearing but I don't know how to interpret it. I wouldn't consider us these just super great friends who have a super big history. I feel like for her, she's taking a leap of faith with me, showing me a side of herself other people don't get to see.

Can you condense the text into three sentences or less?
<bot>: do extroverted displays of contact (I.E. Catlike shoulder nuzzling), and intimate vulnerable discussions (which she does not have often) mean she's interested? Its hard to interpret the signals.