What kind of person lies about having cancer?

I used to chat with a girl online and she kept lying about it for a couple months. When I caught her in the lie, she ghosted me.

What kind of person lies about that? For what reason?
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I've spoken with someone else and it turns out, she lied to another person about her mother having arthritis. It was a lie too. Her mother is healthy.
What kind of person lies about having cancer?
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