wat is the reason for my mood swings.

Dun not b misunderstand,
my mood swings is due to my f**king cousin ONG JUN LONG.
he has been misbehaving in school and all the teachers are tokin to me abt himm.
Miss wong todae find me, TALK TO ME over him AGAIN.
WHY MUZ HE CREATE TROUBLES?
i am worried. =(