Why is a girl behaving differently towards me and only me?

She seems more confident and talks more with other people including guys. But with me she behaves very brief with me for no apparent reason. What messes with my head is she'll start a conversation with me, we start chatting then next thing she is acting strange towards me. I really like her I feel we're both ignoring each other, it seems to just take a while for one of us to break the ice everytime

Why is a girl behaving differently towards me and only me?
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