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There is this girl and she has a cat. I remember in the beginning the cat dies and she has a guy that she sort of dating and she works at the bookstore and at the beginning of each chapter. It says a time like 30 minutes before ( iforget, her name) decided to die. Then when she does die, she gets transported to a library of second choices. the librarian is a school teacher librarian, that she liked. Then she finds the big book about all the choices in her life that she regrets and she gets to choose which ones to undo one by one and she gets to realize a live if she had chosen different

is it possibly The Midnight Library?

You need to add genre and plot details to your topic header. It's mandatory in this enormous group. We close threads that lack those things.

It's definitely The Midnight Library.

Amazon's preview of The Midnight Library by Matt Haig - Courtney and tara's suggestion:

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- There are different cover images.

Yessss thank you!!