Why my female friend stare at me?

Why she stare at me when I'm not look then when I catch her she gaze into my eyes and smile but she hold if a little longer. When she do this she also touches me. We been hanging out every day since December. Now things starting to change. She do this when we in front of people or one on one. Why she keep looking at me? Is this a good or bad thing?
Why my female friend stare at me?
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