My soon to be girlfriend blushes around me?

So this girl and I have been friends for over a year and we both have developed feelings. Anyways she's really outgoing and loud and whenever she sees me she gets really happy and begins to kiss me and hug me. I'm a bit shy but occasionally I'll compliment her and when I do she acts surprised by it and goes "awwww" while blushing hard. We aren't dating yet, so why is she blushing?
My soon to be girlfriend blushes around me?
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