Why does she always say "I don't know" instead of answering straight?

Anonymous
I'm really vocal and direct about my feelings. But the girl I like is the opposite. For example, I'm a very honest person when it comes to how I feel. So, there's this girl I like, and she tells me that some other guy (who I know) has began to sit at their table at lunch. She also tells me that he's more comfortable around her so he talks to her more. Obviously, I'm not psyched about it so I'm a little sarcastic and rude about the whole thing. She asks me what's wrong and to not be all mysterious about it and say it (cuz I usually am) Before I tell her, I even ask her if she's sure she wants to know, and she says yeah so I flat out tell her that I'm feeling jealous of this guy. But she responds by saying "I don't know what to tell you." She does this a lot and it's annoying. I know we aren't dating so I don't have a right to feel this way, but if she doesn't like it, she should just say so. I don't get what her problem is.
Why does she always say "I don't know" instead of answering straight?
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