My apologies for not finishing the rest of the story!
...What he saw next confused him: the couple was walking towards a cemetery.
He got out of his car and followed.
Then he saw his girl: a photograph of her smiling sweetly as ever at him from her tombstone. His paper cranes were right beside her.
Her parents saw him. He asked them why this had happened.
They explained sadly she did not leave for France at all. She had been ill with cancer. She had believed he would make it someday, but she did not want to be his obstacle.
Therefore she had chosen to leave him.