In 'Where Rainbows End' by Cecelia Ahern, the concept of soulmates is highlighted, suggesting that true love always prevails in the end. The quote reflects the idea that fleeting relationships, such as those with ex-girlfriends, fade away over time and can be easily forgotten. It implies that romantic partners come and go, but the bonds formed with best friends are enduring and lasting.

The distinction between romantic love and friendship is further emphasized, as it suggests that while one might have brief encounters or relationships that do not stand the test of time, the connections made with lifelong friends are what truly matter. Ultimately, the narrative reassures that soulmates, or deeper connections, will remain consistent and significant through life's ups and downs.