This girl keeps texting me but I dont like her and I want her to stop but I dont want to hurt her either?

That girl is super nice and all, friendly. If i dont reply her texts for few days, she starts calling me like crazy.
i got a girlfriend and i dont want her know cus that will only make things worse. help
This girl keeps texting me but I dont like her and I want her to stop but I dont want to hurt her either?
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