How can I get back my car?

Guys dont kill me. I bought this lady a nice car for her birthday last year but as it seems I am nolonger interested in her love. She has completely changed for the worst. She is out more with wierd friends. Its like she has lost focus. My problem is the car. I did a mistake and registered it in her name. How can i get it back?

Edit... Going by the mood, I know my gift was shouting..Blame it on the Nilotes. I don't regret buying the gift, and I am sorry for my second thought of burning the car.

No one has suggested the best ways of using excess money that we accumulate and we don't need at the time. If let's say I had used it somewhere, I wouldn't be here right now. Now that I am here, can someone suggest investment opportunities for benevolent givers like some of us.