My first kiss happened under a table.. with my ex bestfriend

Tyler and Katlyn are bestfriends, lovers, i mean were bestfriends, were lovers. He was her first kiss and it happened under the table when they were playing hide and seek with they're friends, they where 9 yrs old.
Everything changes when they got together at the age of 15, bestfriends forever right? or was it together forever?
that's what they told each other until one broke it. He kissed another girl in front of her
Suddenly Katlyn had a thousands of questions in her head... was it worth it, is this worth it.... was HE worth it?... no, not if he broke a promise, not if he kissed another girl in front of her, not if he cheated on her with her supposedly bestfriend... NOT WORTH IT RIGHT? Good thing she's moving away from him, it gives her time to move on

Everything was going great, she's 17 and it's her last year, her final year in highschool and she has a boyfried but it all changes when her parents descided that they're moving back to they're old home town.. and alla she can think of is, ways of revenge on Tyler