In the end I liked this book, but in the beginning I really struggled with the style. Writing everything in form of notes, letters, emails and IMs is innovative but it's hard to read, and for someone who is interested in characters like I am it's not enough, you don't know how they look like, how their surroundings look like. You just get a peak into their conversations and what they want to share with other people, which you know it's not always honest and doesn't tell the whole story about someone. For the story I think Rosie and Alex should have gotten together much earlier and if someone had that relationship in real life they would figure it out much earlier. Like this although it's seemingly a happy end I don't think it is. They basically spent so much time apart and now they have so little time left to enjoy each other, they can't have their own family now, they went over their big hurdles in life without being really there for each other. Yes they were friends and they wrote to each other, but it's not the same as a real conversation and a hug.
For Rosie as a character, I feel sorry for her, she is like a poster girl for everything going wrong in life and I think maybe the author overdid it a little bit, maybe I'm looking from a different perspective but I don't see it as very real.