Why would a girl who rejected me say that “You will never get a girl” when A mutual friend tells her that I have girlfriend?

Anonymous
A mutual friend was teasing me about the girl who rejected me because I used to be obsessed with her. I moved on and got a girlfriend. and never spoke to the girl who rejected me again.

my friend was teasing me about her yesterday, and I told him that I don’t like her anymore because I got a girlfriend.
my friend went on to tell the girl who rejected me, and she responded by saying “Stop lying, he will never get a girlfriend.”

She even told our mutual friend to say that she said that.(Basically telling our mutual friend about how she reacted)

I don’t know whether this is meant to be a joke or what? I never sent my friend to tell her about my relationship status to make her jealous.

What is the meaning of this? She also stares at me when I’m not looking
Why would a girl who rejected me say that “You will never get a girl” when A mutual friend tells her that I have girlfriend?
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