What rule does Mayor break in The Book of Unknown Americans?

In the novel The Book of Unknown Americans, Mayor Toro is deeply in love with Maribel Rivera. Because of the events of the novel and some misunderstanding, Mayor is forbidden from seeing Maribel. It is presumed that Mayor is taking advantage of her, and, as she had been sexually abused earlier in the novel, her parents are extremely wary of letting her around boys in general, especially Mayor because of their incorrect assumption that he had harmed her.
So, Mayor steals his father's car one day so that he can go see her, and he convinces her to leave school for the day, making up a story so she can leave without getting in trouble. This action leads to Mayor being strictly punished and reprimanded.