Resting Witch Face by Juliette Cross

Twelve years ago, Jules Savoie ended her relationship with the vampire overlord of New Orleans, Ruben Dubois. For good reasons. A woman in power must often make sacrifices to protect others. She knows the truth of it down to her aching heart.
When Ruben watches his best friend Devraj get married, a stinging realization hits him hard…he’s done waiting. They say time heals all wounds. In this case, it merely sharpened the pain and made one fact crystal clear. Jules Savoie is his soulmate, and nothing would keep him from her. Not anymore.
Forced to work side by side to fight for the werewolf cause, they campaign together at covens from New Orleans to London. The reignited spark burns hotter than ever before. But when a power-hungry vampire sets his predatory sights on Jules, will their love be strong enough against black magic? Or will he lose her again? And this time, maybe…for good.