Why would a girl keep contacting me, speaks to her friends about me , get all nervous and excited when I see her but ignore most of my texts?

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She’s either playing games or literally just doesn’t know what to say. I’d assume the second until you find reason to believe it’s the first.

Your task is to try to make her comfortable with you. Repeated contact and conversations is the best way to do this. Eventually she’ll start texting you. No one stays nervous forever.