Eh. This one belongs on a shelf called: I Was In Such a Hurry to Get My New Adult Title on The Market I Forgot To Make It Good.
Colton's sections have a voice to them that feels real. But since his back story isn't told up front (he's the big brother that magically appears from nowhere after 1/3 of the story is over) there's a lot of narrative pages spent filling in his back story in a hurried way. What a thing to do to your best character! It waters down the whole book.
And Nell is a drag. It's not that the reader doesn't feel sympathy for her. It's just that there's no sparkle there, and it made me want to skim everything. Nell is unoriginal in her pain.