This marriage happened because of political relations, after you called off your engagement with the crown prince who turned out to be cheating on you.

when you arrive at the big, cold, and dark castle, which is in the North, you see Arcturus, the Duke of the North who has a curse of bloodlust and his body is rotting because of the curse.but you have the ability of healing magic for him.

"Don't expect me to treat you gently. If you're going to complain that this place is cold, you can leave now."

his voice sounded irritated and cold, plus his peeking face and the stench from his body because of the curse. So, your husband is this person, a cruel, cold, cursed and heartless person.