The boy wants to detach from his mother because he believes that he's already grown up. He was embarrassed that his mom still drives him to school instead of riding a bus to school. Wanting acceptance of peers can result in a distancing of a child's parents due to the desire for something.
Mom, I'm old enough to handle myself.
Let's go, son. I'll drive you to your school...
At this point, her son was shy that his friend caught him going out of his mother's car because his friend thought that he uses to ride a bus to go to their school.
Whoa, you're mom still drives you to school?
Mom, I already told you that I can ride a bus instead of you taking me to school. I'm already a big boy.
Do well in school, son. Love you...
The boy and his friend begin to develop their decision-making skills, they learn how to keep a secret and to make a secret. They learn how to trust one another and this is were a change in behavioral autonomy takes place.
It's fine, I'll keep it as a secret. Our secret.
Jake, about what you saw... Can you not tell our friends about it?