In high school, Gaveriel Jane believed she had found something rare-someone who truly understood her. Xiu, a calm and sincere senior, became the center of her world. Their love was simple, genuine, and full of the quiet promises only young hearts dare to believe. But love is fragile when trust is tested. Between them stood Mica, Gaveriel's closest friend and the person she trusted most. When doubts and whispers began to grow, Gaveriel faced a choice she never imagined she would have to make: believe the boy who loved her, or the friend who had always stood beside her. She chose the wrong person. That single decision shattered a love that might have lasted forever. Years later, life brings them face to face again. But time has moved forward. Xiu has built a new life and found peace with Seraphien, the woman who now stands by his side. As old memories resurface, Gaveriel must confront the painful truth that some mistakes cannot be undone. The love she once had is no longer hers to reclaim. Once We Were Us is a story about first love, betrayal, and the heavy weight of regret-about how one moment of mistrust can change the course of two lives forever.