You Promised Me by Lucy Scott Bryan

Haunted by memories of a silly promise Verginius Bellafonte made one summer afternoon with her childhood best friend, the last person she ever expected to see at her new school was him. But fate has other ideas and you should never play with fate.
Hunter Hollingsworth is St Joseph’s star student. He is popular, smart, drop dead gorgeous. And angry.
When Dominic Watson swoops in to save Verginius on the first night at St Joseph’s Welcome Dinner, so starts years of games that threaten to destroy the Bellafonte family and fortune.
You Promised Me, follows the lives of Verginius, Hunter and Dom from childhood, through their drama filled time at school and finishes when fate decides to intertwine the three once again, years later.
Some promises are made to be broken.