Salvus by R. Phoenix

Van doesn’t care if Omar is his fated mate — or whatever other bullshit the world believes in. He’s not going to be trapped in a relationship because the universe says he should be. Worse yet, Van’s not a huge fan of overbearing, entitled, pretentious alphas. Tired of living under the rule of alphas, he runs away to Salvus, a city governed by betas… only to discover that having their protection may not be as idyllic as it sounds…

Omar knows his mate hates him — or at least, Van hates what he is. Even though they have an explosive relationship centered around Omar helping Van through his heats, he still cares enough to agree to take Van to Salvus. But once his mate is gone, he discovers Salvus hides sinister secrets.