She told me to text her later, so I did and she didn't text me back.

there is this girl that I talk to and she told me to text her later, so I did and she didn't text me back... she's done this multiple times and all the times she hasn't texted me back she always says sorry I didn't get to your text I've been real busy. so what does this mean?!?
She told me to text her later, so I did and she didn't text me back.
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