Kim always struck me as a 'girl on a mission'. Yes, Greg was her mission. She would support and nurture him if it meant that she would one day enjoy the fruits of her labour.
Well, history shows that Greg was 'a failed mission'. Hence, Kim has reportedly moved on!
Greg is a child. Steroids were a false prop for him. And now, without a wife to mommy him, Greg returns to his child like state!