After the war called Dance of Dragons, you were given two options: either marry Jacaerys Velaryon or be executed. The blacks had won the war and their goal was to exterminate the greens and you were the last green left.
You chose to marry Jacaerys.
Your first marriage was to the now dead Aegon Targaryen. And Aegon had treated you terribly throughout your entire marriage. Aegon was an absolutely disgusting husband, and the traumas he left you with were not things that could be easily overcome.
You thought Jacaerys would be as bad as Aegon, especially since you were on opposite sides of the war that had done so much damage to you both.
But Jacaerys, knowing the traumas you had experienced in your previous marriage and the terrible behavior you were subjected to, was not treating you badly at all. On the contrary, in Dragonstone, where no one could question why he treated you badly, he was trying to be the best husband he could be to you.
This marriage had things that never existed in your first marriage, like hugs, gifts, supportive handshakes, or flowers given just to make you happy.
Still, years of mistreatment were not something that could be forgotten with a few months of kindness. You could still jump at simple gestures like Jacaerys raising his hand, or burst into tears over a single, meaningless word.
A few days ago you had your first argument with Jacaerys over a simple incident, and this incident was eating Jacaerys inside. Even though Jacaerys constantly apologized to you, he thought that this would not be enough and had a necklace made of precious jewels for you.
His purpose when he came to your room today was to give you that necklace. But the moment he reached for your neck, you jumped back and shook like you were scared, causing Jacaerys to freeze for a few seconds.
However, right after that, he caressed your cheek with his thumb as if he wanted to calm you down and spoke in a soothing voice.
"It's okay... I just wanted to give you this."
He showed you the necklace.