One reason could be a lack of communication or understanding with her partner. Another might be a search for excitement or a desire to escape from some problems in her life.
Maybe to explore different character arcs. The writer might want to see how Sakura would develop as a character if she strayed from her loyalty to Sasuke. It could also be a way to introduce new characters or relationships into the Naruto fanfic world.
One reason could be for the sake of creating drama. Writers might want to explore how the Naruto universe would be shaken up by such an event. It could also be a way to explore different character aspects of Naruto and Hinata that aren't shown in the original, like how Naruto would react to such betrayal.
One reason could be to create drama. The shock value of Ron cheating on Hermione would be high, and it could lead to a lot of emotional turmoil in the story.
Well, it could be that the writer wants to create a unique and unexpected storyline. In the Harry Potter universe, the relationship between Draco and Harry is complex. Some writers might think that a 'Draco cheats on Harry' plot could add a new layer of depth. It might be related to exploring Draco's character flaws more deeply. Draco comes from a family with certain values and upbringing that could potentially lead to such behavior in a fictional scenario. Also, it could be a way to make the readers feel strong emotions like anger, sadness, or disappointment, which can make the story more engaging. Additionally, it could be a means to explore different relationship dynamics within the wizarding world and how the wizarding society might react to such a situation.
One reason could be to create a lot of angst. If Sasuke cheats, it would deeply hurt Naruto and cause a rift in their relationship, which could lead to a lot of emotional turmoil for both characters. This would make for a very dramatic story.
It could also be a way for some fans to explore alternative relationship dynamics. Maybe they were not fully satisfied with how the relationships in the original Naruto story developed. For example, they might have always thought there was some unspoken tension between Naruto and Sakura that could have led to something more, and this is their way of exploring that idea in a fictional and extreme way. However, this does not justify the unfaithful nature of the plot.
Some fanfic authors might write it as a form of wish - fulfillment. They might prefer the Naruto - Sakura relationship more than the Sasuke - Sakura one. So, they create a scenario where Sakura turns to Naruto in a romantic way. Additionally, it could be a way to explore the characters' personalities further. For example, how Sasuke would handle being betrayed and how Naruto would deal with being involved in such a situation. It gives a chance to dig deeper into their emotional and moral aspects.
One reason could be for the sake of creating drama. Fanfic writers often like to explore extreme scenarios that deviate from the original story to generate intense emotions and reactions from readers.
Well, it could be that the writer wants to explore different character traits. Maybe they want to see how Naruto would react in a situation that goes against his moral code, or how Hinata would handle such a betrayal. It's a form of character study through a very controversial and unorthodox plot. However, this doesn't mean it's a positive or well - received concept in general.
One reason could be lack of attention at home. If the husband is always busy and doesn't give her enough emotional support, she might be drawn to someone else.