She won't tell me her personal problems?

ryan_north
I've recently began something of an intimate/sexual relationship with a friend of mine who is a girl. It's interesting because we both share mutual friends from sort of two distinct circles of friends. So we know a lot of the same people.

I've known her for about 6 months now and I feel rather close to her, or at least I thought we are from my point of view. We do a lot things together, we have great talks about things for hours, and she tells me she has feelings for me, but one thing I've noticed though, is that she never really tells me her personal problems, or even much about her past. Or if she does, she'll tell me she's going through problems, but she will never give SPECIFIC details or want to talk about it much. There's always a lot attempts to change the subject when I try to listen or give in soft input.

At first I just figured she was just the kind of person who doesn't open up, but what bothers me is that I often end up finding out the hard facts and details from others later on -- others who I thought weren't as close to her as I was, both her female friends and sometimes even her male friends/acquaintances.

So... now I'm just trying to figure out what that means and how I should perceive this relationship. What are some of the reasons that would cause her to be like that with me and specifically me it seems? The way I'm taking this lack of personal details it is that she just doesn't want to get serious with me, and wants to keep things perpetually light hearted.
She won't tell me her personal problems?
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