IS THIS A GOOD BOOK IDEA?? PLEASE ANSWERRR!!!!?

I think it sounds like a really cute movie :). Also, while (as another answerer pointed out) the plot may seem like something we've seen before, it doesn't have to mean that it's not a unique story. That all depends on how it's written, and while I don't have much to base it on, I think that you could make it work. You're clearly a good writer, and I like the story idea. Think how many best sellers or even how many popular movies have the same plot when you strip it down- it's everything else that can make it either fabulous or on the opposite end of the spectrum. I can't say for sure 100% that it would work without seeing a bit more and reading the actual story, but just from this description I suggest you keep going and that it's a fabulous idea. To improve it, I would maybe try adding some unexpected twist...or maybe put more obstacles between the time Rich tells her what Wade did and when they fall in love and kiss. Also, I wouldn't make Wade cheat on her, make him a jerk otherwise, but Addie so blind to it because she's determined to get settled. This would make Rich have an inner battle about whether to declare his love and tell her what she doesn't see herself about Wade because he loves her. If Rich knows that Wade cheated on her, it would be too easy for him to confront her and tell her about Wade. Also another thing I would do if you decide to follow my first suggestion, is make Addie angry with Rich when he advises her Wade isn't the right guy because at first he told her that her sisters were right in telling her to settle down (even though she missed that the reason for saying this was because he was head over heels in love with her). Also, Addie doesn't realize why Rich is telling her, and when she gets angry he feels farther away and like now he can't tell her he loves her. Anyways, that's just a suggestion, I really like your idea too. Good luck!