Immortal Enemies by Jessie Lane

More than a thousand years ago, their love burned brighter than the sun.
Now, the only thing that burns is his hatred for the woman he once sacrificed his life to save… and his skin in the daylight.
Arne Eriksson grew up in a time when Vikings ruled the seas. He’d longed for the day he would earn his entrance to Valhalla. A treasured afterlife he’d never see since being turned into a vampire.
The person responsible for making him a monster– the woman he’d once wanted to marry.
Liv Nornssdottir was the outcast of the Viking era. The daughter of the mystical Norns and accused of not being entirely human, the village shunned her.
All except for one… a boy who grew into the man she came to love.
When he sacrificed himself to protect her, she did the only thing she could think of to save him– she had him turned into a vampire. Something so taboo she knew it would cost her Arne’s affections for all eternity. In the moment, she didn’t think, she reacted.
She’s been running from him ever since.
Lovers turned to immortal enemies.
The problem is… he’s found her.
And Arne is none to happy to learn the woman who damned him to an eternity without glory is also his mate.