He might feel extremely betrayed and angry. In some cases, he could cut off all ties with Hinata immediately. Naruto is a passionate character, and such a discovery would shatter his trust in her.
The story could take a dark turn. Naruto might become bitter and start to isolate himself. His friends would worry about him and try to bring him back to his old self. There could be a lot of drama and tension within the group.
Well, in the 'hinata catches naruto cheating fanfiction', it really depends on how the author wants to develop the story. Maybe Hinata, after catching Naruto, decides to keep it a secret at first to figure out more about the situation. She might start observing Naruto more closely and try to find out who he is cheating with. And then, based on what she discovers, she will take different actions. For example, if it's a misunderstanding, she will feel guilty for doubting Naruto. But if it's true, she might seek advice from her friends or family on how to deal with it.
For Hinata, if she's actually innocent, she would be heartbroken that Naruto thought she could cheat. She might have to fight hard to prove her innocence. If she was at fault, she would likely face a lot of guilt and the loss of Naruto's love, which was something she deeply cherished. In the fanfiction world, this could also lead to changes in the social dynamics among their friends. Their friends might be divided, some believing Hinata and some believing Naruto's initial perception. It could create a rift in the whole group.
One possible outcome could be Naruto feeling extremely hurt and betrayed. He might distance himself from Sakura completely. In the context of fanfiction, he could also focus more on his training and his other friendships, like with Shikamaru or Kakashi. He might become more determined to prove himself without Sakura's support.
Another possibility is that the writer wanted to explore different character reactions. Naruto might initially be devastated. He could go through a phase of disbelief and then anger. However, if it's a well - written fanfic, there would likely be a resolution where the truth comes out and their relationship is either repaired or redefined.
His friends would likely be shocked. Shikamaru, for example, would probably be disappointed in Sakura. He might try to comfort Naruto and tell him to think rationally. Choji might be angry on Naruto's behalf and want to confront Sakura. And Sasuke, if he's around, might have a complex reaction. He might feel a strange sense of satisfaction that Naruto is finally seeing Sakura's 'true' side, but also a bit of pity for Naruto.
Since it's a fanfiction, the idea of Hinata cheating could be a very unorthodox and out - of - character concept. It might be the result of the author wanting to create a controversial or alternative storyline. But in the official Naruto lore, Hinata is not associated with such behavior.
I'm not sure if there is such specific fanfiction. Fanfiction can cover a wide range of wild and unexpected scenarios, but this one seems rather unethical considering the original relationships in the Naruto series. It's also not in line with the positive and loyal characters' personalities in the original work.