"Because you need a wife." a cover to hide your dirty laundry? Did he think she did not know that he had an affair and he only needed a wife to show your majesty.
The old man must have felt hurt. Garry was married to his eldest daughter but having an affair with his youngest daughter after the death of his first wife.
He refused Meredith to marry him. That was the only reason he married someone else.
She wanted to slap the truth on his face but refrained. He was already suspicious about her. No one knew about their affair. Even she came to know about it only when she was about to die.
"Ha!" he let out a hollow laugh and looked away. She could feel the veins popping out of his skin. He must be angry to realize that he needed her! He was weak in front of her.
But the luxury only felt scratching her heart.