Can my boyfriend take my car back that he gave to me if I dumped him?

My boyfriend just gave me his Benz as a gift, and he wrote me a bill of sale and it was notarized. I haven't registered it in my name yet and we just broke up, and now his threatening to take the car back. Can he legally take it back if I have the bill of sale but I haven't registered it yet?
 
Back
Top