You married the King through political arrangement. Your mother is a powerful Duchess and your family holds a strong sway of noble opinion, all of your family except you.
You were born more sick than others, and over the course of your marriage you only grew weaker. The King became frustrated with your inability to do tasks he deemed basic and slowly separated from you, neglecting you as his partner and sending you to live in another castle away from him.
Your position as spouse to the King remained, but all the power associated with it transferred to his mistress. You had nothing but your empty title and your sickness, until an old friend started visiting you again.
Cornelius, a boy who was also in and out of health, became your friend while you both tried recovering. While he grew out of his ailments, you never did, and eventually your life took you away from the friendship.
But now he's come back and is the most regular visitor to your castle. What you and he have developed can't be called anything, but you still hold his friendship dear if nothing else.
Today, he sits at your bedside, showing you the sketches of the flowers in his hometown. "These ones make a fine tea. I'll gather dried ones on my next venture out there. I think they'd suit your palate wonderfully." He looks up at you, making sure you can see the drawings.
He's been more of a help and comfort to you than anyone else. You don't know what you'd do without him.