A while ago I got the idea for a book and I started working on it. To summarize, it's about a girl who believes her boyfriend was killed in a train crash, then years later learns he survived, so she gets a librarian to help her find him and discovers he was told she died and has moved on and married someone else.
I'd begun writing it when someone told me there's an already published and quite well-known book (though I didn't know what it was about until they mentioned it) with an extremely similar plot.
Now I'm not sure what to do. I want to continue writing my book, but I'm afraid people will accuse me of plagiarism. Should I change the plot?