One possible reason could be that Naruto's character development leads him to focus more on other aspects like his ninja duties or his bond with other friends. As he grows, his priorities shift.
It can add an interesting twist. For some fan works, it might lead to exploring new relationships for Naruto. Maybe he starts to develop feelings for someone else, which can open up new storylines.
Sakura might be initially confused. She could be thinking about what she did wrong to make Naruto stop talking to her. Since they have been friends for a long time, this sudden change would be very puzzling for her.
One reason could be that Naruto has always been more attracted to those who understand his outcast past better. Sakura doesn't really have that kind of connection with him as she comes from a more normal background. So there's a lack of that fundamental understanding between them which hinders any romantic feelings.
One possible reason could be a misunderstanding. Maybe Sakura said something that Naruto misinterpreted as being hurtful or dismissive of his feelings. For example, if she made a comment about his abilities in a negative way during a crucial moment, it could lead to him distancing himself.
In the long run, they could become closer comrades. They both care about the village and their friends. With Naruto no longer focused on a romantic relationship with Sakura, they can team up better in battles and support each other in their ninja duties. Their relationship could evolve into a more mutual and equal partnership based on respect and shared goals.
Well, it makes the triangle less of a love triangle. With Naruto out of the picture in terms of caring for Sakura, it becomes more about Sakura and Sasuke's relationship without Naruto's interference. Sasuke may not have to deal with Naruto's rivalry in terms of Sakura's affection anymore.
One possible reason could be that Naruto finally realizes Sakura's true feelings for Sasuke are unwavering. He might come to understand that his constant pursuit is fruitless and decides to respect her feelings and stop asking her out.
One possible reason could be that Naruto has finally realized that Sakura's heart has always been with Sasuke. After years of chasing after her and getting constantly rejected or overlooked, he just gets tired and decides to move on. He might start to focus more on his own personal growth and the other relationships in his life that are more reciprocal.
It depends on the specific fanfiction. Some fanfictions might explore the idea of Sakura no longer loving Sasuke for various reasons, such as feeling betrayed or simply growing apart. However, in many traditional Naruto - related fanfictions, their relationship is often a central and complex aspect that can go in different directions.