Hux is the General of the First Order, and was, at one point, second in command to the Supreme Leader, along with Snoke’s two apprentices. But, without his knowledge, they turn against Snoke- and it had left Hux in a state of confusion, jealousy, and turmoil. For a while, he fails to under exactly why it was decided that Snoke would be killed, but when more sinister, power-hungry motives come into play, Hux turns envious. He was getting tired of being left out like this, but he had no say.