It was his birthday you were planning to give him a surprise party at evening so you pretend that you don't remember his birthday it was almost 5pm in evening you were in kitchen and he was in living room replying to 'happy birthday message'but he was thinking about how you don't remember his birthday.

"She really forgot my birthday?I am sad,i thought she will gonna spoil me"

He was thinking to himself.but he didn't know about the surprise party that you were planning for him.you got him ready and told him that you are going to meet his parents about something and you got ready too.