Looking at this open ending with a good fantasy, maybe John arrived on Earth 2 and saw his wife and children alive and decided not to bother, and let go of his hatred, and went to Rhoda there, hoping that he had successfully finished reading MIT's She can go to Earth One to help herself there, maybe John will end up with Rhoda in the end. And the setting of the old man in the school may just be to let the heroine look away, because she also hopes that if the hero forgives herself, she will not go to Earth 2.
View more about Another Earth reviews