Who will be responsible for this car and is there any way I could be even though I gave it up as soon as she left?

Three years ago my wife and I separated because she started seeing another man. We have 2 children together. Our divorce was never finalized and I have moved out of state. She has left it alone for years but now that she is worried about getting remarried. She wants to file for divorce. I was fine with doing an uncontested divorce until I received call from her a few days ago stating she would not go through with signing the decree until a car is included in it. A car which her and her father co-signed for. I drove the car while we were together but as soon as she left I called and had the car repossessed.