The Rule Series by K.C. Blake, Kasi Blake

They don't call him Jackpot for nothing. Jack has always beat the odds... at least until now. When he was attacked by a werewolf, vampires saved him. When he got tired of living the vampire life, another werewolf attack freed him, making him human again... moreThey don't call him Jackpot for nothing. Jack has always beat the odds... at least until now. When he was attacked by a werewolf, vampires saved him. When he got tired of living the vampire life, another werewolf attack freed him, making him human again. Now Jack just wants to live a normal life, but what's normal about a hunter girlfriend, a brother who wants to stake him to be on the safe side, and a head werewolf building an army to rule the world? Jack gets caught between his old friends and new, hunters and vampires. He wants to stay loyal to both, wants to protect everyone. Unfortunately, both sides are determined to kill the other. In the end, he'll have to make a choice. less

This is the second of the Rule series. Vampires Rule was the first. This book begins a few months after the first one ended and continues to follow Jack and Silver as they prepare for their battle with head werewolf Jersey Clifford. Jack’s world is falling apart. Silver has told him she needs space, he might not graduate from high school, and he feels incredibly alone. Enter a new threat, a new enemy. The question is does she want Jack dead, or does she just want him?