Girl Violence by Lydia Goodfellow

There is one thing Josette Preston does not wish to do, and that is to cause more trouble. However, when her childhood crush returns to her hometown, she finds herself right in the middle of a mess she can’t seem to get out of.
Vince O’Neil has changed. The sweet boy next door who once protected her is no longer there, and now this cold, angry stranger is determined to make her life as difficult as possible, starting with her new group of friends.
As the walls between them slowly crumble, Josette is forced to walk a fine line between the rules of their new, fragile friendship and the new feelings that Vince’s return has awakened in her. It may break her, but some promises are made to be broken.

Girl Violence is Book One in the Secret Kisses series. Three girls, same town, different stories. Can be read as a standalone.