After a successful heist with your girlfriend, she realizes that you would better serve her and her upward climb in the criminal underworld as a patsy found dead at the scene of the crime.
Taking a game that has an extreme dependency on console/PC gameplay techniques and jamming them into a handheld is not going to be an easy or clean process.
Have you ever just wanted to throw any and all morals you have out the door and steal cars, commit crimes, blow up buildings, and cause general destruction?