Why is this girl doing this to me?

I have a crush on a girl that I work with. We like to flirt around sometimes, have conversations and so on. One weird thing happens. Whenever we talk with her or sometimes at random times, we lock our eyes for a long time and hold it. A few times she would be standing in a spot and I would walk towards her and we would hold eye contact the whole time and when I would get closer, shed look down quickly.

There are times, though, when I feel her staring at me when I'm not looking. When I look towards her or at her, she immediately looks down and when I look away she looks again.
Why is this girl doing this to me?
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