She says she's nervous around me. Why would she do this?

this girl started talking to me and she's always talking and texting me. but over the weekend I texted her and she didn't reply. she called at 1 am for a couple of minutes then I went to bed. I woke up and she had texted me I replied and she never replied back. gthe next morning the same thing. I'm confused because she's said she wants to hang out but she tells me she'd be nervous. and she says she's nervous around me. and she doesn't seem like a shy girl... help I'm so lost?

She says she's nervous around me. Why would she do this?
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