why????????

why did they change it so much? I need to know. the book was so good they decided to make a movie, then they change EVERYTHING. it tells the wrong story from beginnig to end. I have never seen a movie change the book so much. she is not supposed to crumbly she is the strong one. I can't believe they did this. I wonder what nic sparks had to say? I say its not worth making a movie other then for money, because its not even the same story. I hope they don't destroy dear john like they did this. and the notebook, noah doesn't die at the end. and don't get me started on a walk to remember.