bruh yall readers are so one dimensional thinkers. Ofc it was about fred but Selena thought he was referring to her. Because she stood in his way to take over serentiy, that's why she thought Izer too hated her. And nor he ever confessed her until now that he doesn't hate her. And that's not Selena's fault nor she owes him anything. He was a stranger and he was always cold to her, he never once tried to behave like a husband to her. So put yourself in her place, where you are isolated from the rest of the world, lonely, forced into a marriage with a stranger, lost a mother, her childhood dream, saw people of her loved ones commiting suicide and departing their ways, on top of it, she felt anxious that he was going to kill her at some point and take over her family business.
And fred was the only who genuinely showed her care during those dark times so she really doesn't care about the labels because this 'husband and wife' titles never carried the meaning they should have, like they both say, it's just on the paper. Inside those 4 walls, they are just strangers trying to survive to their best.