Sam Uley

Sam is the leader of the werewolf pack (although this position should have gone to Jacob Black, Jacob let Sam keep the position, taking the role of second-in-command). Before becoming a werewolf, he was romantically involved with Leah Clearwater as high school sweethearts, but his relationship with her started to fall apart after his transformation, because he was forbidden to tell Leah what he had become. The relationship was destroyed for good when Sam imprinted on Leah's visiting second cousin, Emily, and went back on every promise he had ever made to Leah. According to Jacob, Sam feels guilty about betraying and responsible for the bitter person Leah has become.