Dude, you only spoil your self.
You cannot be spoiled by someone simply telling you how a story ends. Someone saying, “This happens to person X and Y, person B and D hook up finally, person T and L kill person D, person B commits suicide; person A rides off into the sunset, and person Z goes insane.” is not the same as the author saying, “This happens to person X and Y, person B and D hook up finally, person T and L kill person D, person B commits suicide; person A rides off into the sunset, and person Z goes insane.” In the end, you will still have to experience the way that the author wants to present that information to you, whether you know it or not. Knowledge is power, so use a spoiler in your advantage and maybe start thinking about how that could possibly happen to person A, who’s a horrible, horrible creature of a man, yet somehow made it out of the storm alive. Maybe person A is redeemed, maybe the author just likes to have a bitter ending for people who hated the villain, maybe person A will be killed in an epilogue by a protagonist who comes back to life, etc. Knowing does nothing, it will not take away from the experience that the author will give you personally. There are only a few cases where knowing were less than lucrative when it came down to it, such as if you saw the Fight Club movie before you read the Fight Club book, because there’s only a slim difference between them, and that’s the 30th chapter, which is only in the book: the film covers chapters 1-29, but never the last chapter where Jack (Joe in the book) is institutionalized. Oh,