Endgame, by "LoGan". My older brother was into PUA stuff, I was dumped recently so he recommended me to read some things. All the other books and blogs were like "you have to do this one trick to get laid", but this book was a bit deeper. It changed my mind about being a happier and more fulfilled person by myself, and don't stress over being liked by other people, which in turn makes you more likeable.