I'm Thinking of Ending Things

Story : Some girl and her boyfriend drive to his parents to met them, but things start to get weird and stuff... that ending is so weird. From the middle of the book I started being interested, because the rest are just flashbacks with that girl that I couldn't care about. The second half has some really nice tense parts, but the final pages are so confusing and random + you know who is behind this whole thing because it's so predictable! Maybe I've seen things like this before, so it wasn't a surprise, but for people that don't know this plot twists, maybe they will enjoy it more, idk. There are parts with an investigation that I kinda liked, but gave away the whole plot.

Characters : This girl, we don't know her name, is so annoying, my God! She wants to break up with him, then she doesn't, then she does, then she doesn't... can you decide or not? She says that she shouldn't do something, but then she does it anyway... how can I care for this person? Jake was alright and I really liked some discussions in the car... life, death, cars, you know, thought provoking things.

Overall : It has some suspense, but if you know what's going to happen, it doesn't matter. Also, the ending is not satisfying because you don't know what happens... I have to come up with my own theory, or Reid explained it and I didn't get it because I'm not so smart? Anyway, I read this because I saw that Charlie Kaufman is going to make an adaptation of this...