I found it gut wrenching Brad could never of protected Aidra. He swore to protect the people, never could he of stopped the marriage which temporarily stopped wars, no matter what love was between them. As to what type of love, I'm not sure. If I had to guess it seemed pure like soulmates devoid of lust or greed, beautiful in it's tranquil mutual love and admiration. After the incident in the forest it seems Aidra understood the roles they had to play, being greedy would only hurt those around them. Being strong men and women their duty to their people comes first above all.
I just wish they could of said goodbye, fucking dammit that wasn't fair why didn't they get to say goodbye