re: What's a book that you wished you had never picked up (because it sucked so bad)?

Because Netflix recently made it more publicly known with a limited series, I can't help but say Behind Her Eyes by Sarah Pinborough. And it has nothing to do with the major twists in the 2nd half of the book (that actually makes the book a hell of a lot more interesting and...odd. Although still not very good). But basically because the entire plot rolls forward because the main character is a complete moron. She makes the wrong decision at every fork she comes to. She is the stereotypical irrational, weak female lead that is being frowned upon now.

Plus there are 2 or 3 chapters of the book early on that are exactly the same. In those, the main character knows she should cut off the forbidden relationships, but then convinces herself with poor logic to continue with them. The book could have been shortened by 100 pages with better flow and less repetitiveness.