What should I do friend under my car insurance and won't pay his half of the bill?

So my friend has been under my car insurance for the past 3 years due to personal issues. For the past year I had to case him down for money and now he won't pay it's 5 months. His car is in my name what should I do! I don't want him getting me in trouble if he gets tickets since the car in my name. He owns the car which is worth 10k
What should I do friend under my car insurance and won't pay his half of the bill?
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