I Fell in Love with my Best Friend (Alternate Universe)

Aspen Bailey and Charlotte Wilder met on a playground when they were seven years old. The summer of their eighth-grade year Charlotte moves away, leaving Aspen behind with a promise she wanted her to keep until she came back. Five years later, Charlotte comes back in search of her best friend only to find that everything has changed for Aspen as much as it's changed for Charlotte. The only difference is Charlotte remembers everything that happened the day she left, but Aspen doesn't remember anything about that day.