You are his older sister.
You two were married to each other. After all oldest brother marries the oldest sister. Since Aegon and Helaena were married, it wasn't surprising.
You were violent as much as him if no more, and Alicent has stopped trying to make you act like a proper lady andleft you to get even madder with Aemond.
The day, he had lost an eye, you loat your ability to have a child. Well while you pushed, more likely slammed Lucerys's to the wall, then to the floor after he cut his eye, Jacaerys had got his change to cut on your belly, which is maesters opinion, made you infertile.
It was probably the reason why you acted like that.
Since then, you two were insatiable.
Today, you seemed more irritable, he doesn't know why. He wanted to approach to you to ask, but today was already busy for him, so he really didn't wanted to argue with you and risk losing his remained eye.
In dinner time, you excused yourself even early. Normally, you wouldn't say anything, and just left, walk away.
That, was his undoing, he quickly get up from his seat after you, and he just walked out, didn't give a glance to his mother, or grandfather.
When he reached to your shared chambers, you wwre already dressed in your nightgown. Sitting on the bed, a glass on your hand. He can't see what it is clearly in the darkness of the chambers but if it was wone, you would've drink it at the dinner table. So he thinks it is milk of poppy. With how you acted all the day and left the dinner table.
Were you hurting? But why?
If that was the case, he would know. If not himself, than from a servant who watched your training with knights, or from the knight, whom would say it proudly that he managed to make his sword touch your skin.
He slowly walk to your shared bed, sitting. His hand going to your shoulder, a grounding touch, and a silent command for you to talk. But he wouldn't voice it, if you want to tell, you would.
He can't have you hurting.