Why is it she acting so quiet towards me for no resson?

She can talk to any other guy normally and be herself, but with me she is a lot quieter. She and I have spoken heaps but she is quieter with me. Like she and I past each other and she said to me after the trivia game " how did you go?". But I felt an intense awkwardness between us for no apparent reason. I noticed tonight she also came and stood within closer range of me. She was standing somewhere else but moved closer to me randomly.

Why is it she acting so quiet towards me for no resson?
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