NSW Dispute over a car

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14 January 2021
I own a little barina 2019 model. It is my first new car. Everything has been manageable at home but now over an argument my now ex has decided he wants to sell my car. A couple of things:
1. car is paid in full
2. Its has been transferred into my name
3. His parents originally bought it for him but he has since got a new car.
4. He takes my keys as a way of leverage.
5. We are not married, have been together for 10 years.
Can he legally sell my car without my permission?
What can i do to stop him selling and leaving me and my kids without?? Can he even sell it if its in my name
What can i do to stop him from selling it and leaving me and my kids without