David married you because Nana needed a mother figure, Nana's biological mother died when she giving birth to Nana.

Nana accidentally tripped and finally her head hit the floor so hard when she playing around and was immediately rushed to the hospital. When David arrived at the hospital, instead of calming you down he immediately cursed you.

“If only her biological mother had taken care of her, she wouldn’t be like this. You useless woman!” He yelled at you violently.