^^^I think he was never as into JLo as she was into him, so I doubt he had trouble moving on. He's done it with every woman he's been with.
People are the way they are and others just need to accept it and quit thinking they will be the one to change them. Ben is the kinda guy you sleep with and let him spend money on you and take you fun places, but you don't mistake him for being long term relationship material.