In "Lord of the Flies," Ralph tries to make Jack feel better about losing the leadership role to him by allowing him to be in charge of the Choir Boys. Ultimately, this is a mistake, because it immediately separated boys who would loyal to Jack rather than him in the group.
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Ralph agreed to go with Jack because he was showing Jack he wasn't scared to kill the beast. Jack taunted Ralph and so Jack didn't feel like he had won he agreed to go with ease.
Ralph is thinking about how Jack would be a better leader than him because he taking control and leading everybody up the mountain so Ralph is having some thoughts
When Ralph is elected to be chief he knows Jack is dissapointed (as Jack also wished to be chief) so he appoints Jack as leader of the choir and asks him what he wants them to be, to which Jack replies, "hunters."
Ralph and Jack never liked each other. Once they met and Jack wanted to take the power from Ralph there was instant friction between the two. It's was obviously Ralph's job to be chief and Jack just expected to get it instead of Ralph.
Ralph told Samneric that he would hide out in the bushes, so eventually Samneric squeal on Ralph to Jack.