Someone else's love story

I'm struggling with a rating on this one because I LOVE LOVE LOVED this book until the last 20 or so pages, when the horrible circumstances of Natty's conception suddenly became.....not that horrible? Maybe ok? Perhaps not such a bad thing after all? I always enjoy Jackson's work because she is able to create such rich and full characters, and this novel is no different. But the ending. I don't want to give spoilers, and in general I try not to judge books based on my own moral compass, but there are some things that are just not okay, and I am having a hard time with the author's choice on this one. Reader beware - this one might be a rough one.