The real ending is at chapter 7. Don't read the alternative storyline, if you want to make sense of the main story.
I don't know how people can like it. I'm disgusted beyond believe and nearly throwing up, even thinking about something between them, after reading the main story from 5 years before. I even skipped the flashback of the childhood, because I couldn't stand the ashole.
But so glad the main couple have their happy ending.
Got boring at chapter 5 and freaky, dropped it.