Ask your G/F for the equal 1/2 value of the car, or the car will have to be returned, but if you signed up for the car then you are obliged to sort out the HP as its in your name, contact your EX & tell her that you are stopping payment for the Insurance but LET HER KNOW, regards the finace, either let her pay you up or send the car back, but let me warn you, depending what you have paid on the car & how long you have had it the HP can ask you to pay.