Girl's Behavior

Why is my crush so bossy and weird with me?

So I'm pretty sure my crush has been flirting with me for the past dew days. Like when she sees me she'll have a huge smile and in a flirty tone go "hiiiiiiiii." Then today as we were talking about class she goes "and that's why I love you" and said it really fast and nervously laughed and immediately switched the subject back to what we were talking about. Then she got really bossy and sassy with me in a fun way. Do you guys think she's serious? Why is she like this?
Why is my crush so bossy and weird with me?
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