What does it mean when your girlfriend can't stop saying how she hates her ex when the topic is brought up?

brettb
My girlfriend randomly brought up how her ex is dating this girl who is a bigger woman. She then kept on saying how she hated her ex continously and then kept making fun of the girl who is bigger even though mygf has never met her...Could this mean anything? We are currently fighting over this as I believe this possibly displays hidden emotions still. In general rule of thumb, could this mean feelings are still there even though she doesn't want to tell me? Is it immature to call her exs new girlfriend names? Any advice or perspectives would greatly be appreciated.
What does it mean when your girlfriend can't stop saying how she hates her ex when the topic is brought up?
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