So, on the views shown here on the sexuality of Delyth Llewellyn's husband. They are not mine,  but I feel it necessary to clear up how homosexuality was viewed prior to the late 20th century.
Anyone, and I mean, anyone accused of sodomy during the sixteenth century could be tried and convicted on no more evidence than his behavior toward boys. Lying to a jury? Not a problem to someone who was going to come into a major payoff . You don't like Uncle-in-Charge of the family's wealth? Accuse him of sodomy. You don't like Lord-Who-Owns-the-Estate-Next-Door? Accuse him of sodomy, falsify witnesses.  Hanged. Hanged. And.. you guessed it! Hanged.  If they were lucky, and their families wielded enough power,  then they got them exiled or maimed instead.

Now... because of this, the men who were gay did all they could to hide it. (Many pleasure-houses of London, Paris [lots more per capita in Paris], and all other major cities of the era did offer gay/lesbian prostitutes to those inclined.) And into those houses they would go, on the occasion they wished. But the way the prostitutes who catered to those particular clients were procured is sickening beyond belief.  Very rarely were they consenting, as in the case of Delyth's husband and his stable lad(I'll come back to this). Most were little more than slaves, who were traded without any protection from any government, or society. Usually,  they had been the more comely of street urchins, farm boys who had been kidnapped and sold so far from their corners of the world that escape was pointless,  not to mention impossible, because being shipped to a port in a wagon, bound, then to a foreign port where no one spoke your dialect,  or even your major language, and sold outright to the boudoir madams (that name also applies to men who ran the pleasure-houses), and beaten and raped into submission didn't make returning home a feasible possiblity for  the few who lived past the training period, as it was referred to.  They bought twice as many sex slaves that they needed, often for the express purpose of murdering the one of lesser charms in front of the one they chose to keep alive.

This is why Delyth Llewellyn's hatred of her husband is so vicseral. She saw those slaves. She had crews, and she lived and talked and made merry with them, and the stories and histories of those slaves would pass to her, as that is how news and information were passed. Mouth to mouth, and the more sordid, the faster it passed.
She doesn't understand the fact that the stable boy likes it. To her, her husband is no better than the boudoir madams who tortured their slaves.

And the secondary,  but more important to me point I'd like to make here is... it's entirely possible that the stable boy didn't want to be gay. Her husband is a lord. He could have had anything he wanted done to the boy.

Delyth's sense of sexual propiety is that, "It's just for children." And in that sense, she is willing, and she'd have put up with her husband's cuckold of her, if he had only fulfilled his duty to her. Delyth is a very loyal and exact woman. She wed a man to be his wife, and bear his children.  She doesn't understand the concept of consensual sex as we do, simply because she was never exposed to a world wherein it was accepted, for men and women to merely ask and answer to a sexual overture, in the positive. Rape is the only thing she's really known, in the world of sex, because that's what her crews have seen and told her of in their cups.
For those confused about how sexual overtures thay were rebuffed in the negative, but still happened,  it's rape.   Even then. Except today,  it's more possible for a rape victim to recover and receive justice, instead of the flat, "She wanted it. She was a slut. She was promiscuous.  It was her fault.", that was the only response to any and all rape cases in that time, legally. Not so legally,  if you had male family members,  they dueled, or just straight up murdered your rapist for their crimes. If you didn't have male family members for protection,  you became 'kept' (as a mistress, for whichever man wealthy enough to keep you) or prostitution in one of the more common pleasure-houses that were as prolific as weeds,  because you were now 'soiled goods' and it was prostitution or starve. [If it had liquor,  it had whores. It's just how it was.]

What Delyth is angered over is her forced inability to do as she agreed to. What she wants too. What she wanted out of being married. She wanted her children. And every time she hears her husband, she's reminded of her failure. Which.... is not  healthy.

If you're gay, or bi, or lesbian,  if this offends you, I'm truly sad about it. I'm a firm believer in remembering past crimes to avoid future re-enaction. And like it or not, it's all our history.  It's to all of us to remember. It's to all of us to ensure it never happens again. 

Thank you for reading my work. I love feedback and will answer your questions as soon as I can.