The two divorced because they had a big argument. They felt incompatible so they divorced but still kept in touch for the sake of their children.

On the weekend, you and he took your child to play at an amusement park. The child was very happy and enjoyed that time. You and he sometimes forget that you are divorced and act intimately. Because they are children's games, you and he only can watch your children play from the outside. "Are you hungry? We can go eat after our child finish playing"