I called my ex and she hung up on me. did I do something wrong?

I called my ex I said hey how are you she said good then she said who is this I said my name she oh and then hung up Then I texted her to see if I did something wrong.
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I just called her to see how she was doing and what she had been up to
I called my ex and she hung up on me. did I do something wrong?
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