Literature analysis book

I am reading diary of awimpy kid. In this book there is a kid named greg and his friend rowley trying to survive middle school. Greg is a kid who wants to be at the top of things and so he wants his friend rowley to be the same. Later on lose friendship when greg uses a coat of his were he got in trouble but only saw greg but in a rowley coat. But once they get picked off from teenagers greg had sacrificed his fame by eating the cheese so rowley wont get humiliation.