I think people focus a bit too much on the 'obsession' label when they talk about 'A Night's Mistake.' Sure, it's there, but it's not this gothic, all-consuming fire. It's quieter, more insidious. The protagonist's fixation on that one night isn't about passion; it's about control. They're trying to mentally reconstruct every detail, every word, to find the exact point where things went wrong, as if pinning it down could rewind time. The regret isn't a single wave of sadness; it's this constant, low-grade static of 'what if' that interrupts every present moment.
What hit me harder was how the book shows obsession as a form of paralysis. The character gets stuck in a loop of replaying the mistake, and that loop itself becomes the real prison, preventing any actual atonement or movement forward. It's less 'I must have this person' and more 'I cannot escape this version of myself.' The regret morphs into a selfish thing, because the obsession with their own failure overshadows the original harm done. The ending, where they finally let the memory become hazy, felt more unsettling than cathartic—like they were losing a part of themselves, even if it was a rotten part.