In fanfiction, it might be because of personal growth differences. Naruto may grow in a different direction than Sakura or Hinata. Naruto could become more power - hungry in some interpretations, which goes against the values of Sakura or Hinata. Also, family issues could play a role. If there are problems with raising their children, like different parenting styles between Naruto and his partner, it could lead to a breakdown in their relationship and ultimately divorce.
It can have a polarizing effect. Some fans might be really interested in exploring this darker, more complex side of the relationships. It adds a new dimension to the Naruto universe that they enjoy delving into. For example, it can inspire new discussions and fan theories.
The other members of their team or the village might have mixed reactions. Some might side with Sakura, understanding her point of view, while others might think she's being hasty or that they should try to preserve the relationship for the sake of the village's stability or their own friendship circle.
One possible reason could be Sasuke's continued absence. He's often away on missions, leaving Sakura feeling lonely and neglected. In the story, this could build up over time until she decides she can't take it anymore and argues for divorce.
One possible reason could be Sasuke's continued obsession with his revenge - even after they got married, his focus on past grudges might have driven a wedge between them. Another could be differences in their life goals. Sakura might have wanted a more settled family life, while Sasuke was still drawn to his wandering ways in the name of protecting the village from afar.
One possible reason could be Sasuke's continuous absence. He is often away on missions, leaving Sakura feeling lonely and neglected. In fanfiction, this could be exaggerated to a point where she can't take it anymore.
One reason could be that Sasuke realizes his true feelings for Karin were always there. Maybe in the fanfiction, he had some sort of epiphany that his connection with Sakura was more of a convenience or misunderstanding, while his bond with Karin was deeper on an emotional level.
One reason could be misunderstanding. Maybe Hinata sees Sakura getting too close to Naruto and misinterprets their friendship as something more. And Sakura, on the other hand, might not be fully aware of Hinata's feelings for Naruto and act in a way that Hinata perceives as a threat.
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.
One possible reason could be Sasuke's continuous absence due to his solo missions. He's always away, leaving Sakura feeling lonely and neglected in their relationship. This lack of emotional and physical presence can gradually erode the bond between them.
One possible reason could be differences in their long - term goals. Maybe Mal wants to focus more on her own kingdom and its development, while Ben is more centered around his own kingdom's affairs, leading to a rift between them.