Why is she speaking and acting differently around me all of a sudden?

backpackboy365
I friends with a shy girl and Im confused by her actions around me. When we first started talking she was speaking in a comfortable dynamic level, not too loud and not too soft either. We would talke about things that went on in our lives. But then recently, I have noticed changes. She is starting to speak really quietly and is almost unaudible around me, though it looks like she wants to talk and listen to what I have to say. Whenever I have to leave, she gives me a genuine wave of goodbye and smiles at me. When we first started hanging out, she always looked at me like anyone would look at a friend. But now, she doesn't really look at me anymore and speaks really quietly. I can tell that she does want to hang out with me but Im not understanding why she suddenly became quiet around me.
Why is she speaking and acting differently around me all of a sudden?
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