My girlfriend doesn't get angry anymore should I be worried?

Anonymous
I sent her a picture of a piece of steak that I had at a fancy restaurant and asked her if she remembered the steak. She replied she hasn't been to that restaurant turns out I took my ex there and my ex got me the steak my current gilfriend didn't get angry, she usually gets upset and jealous but she said "I don't even feel anything I'm really over it" when I asked her. I'd prefer if she was angry
My girlfriend doesn't get angry anymore should I be worried?
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