This girl rejected me a while ago, but she still continuous to glance at me. Why?

We had a thing a while ago, and she rejected me. It wasn't one sided, though. At one point she did like me, too. Since then, we've become very close. But I could always feel some sort of tension. She's also since done stuff like lay her head on me shoulder when she's tired, we lend each other clothes when we stay over at each other's houses, and we've slept in the same bed, too. She also seems to see me as like her protector. And back to my question, she ALWAYS glances at me whenever she gets the chance. I can provide more context if needed.

This girl rejected me a while ago, but she still continuous to glance at me. Why?
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