So, so far as she knows, he's the last guy on earth, and this bimbo not only kicks him down a couple flights of stairs, she also abandons him to a life of cruel isolation just because he's not her first choice of sexual partner? Who said the situation had to be sexual in the first place? She just gave up her only human companionship because he was fat - something that would be quickly alleviated in an apocalypse-factor scenario where the rest of humanity's vanished, anyway.
I can't read this, it's retarded. She's retarded.