He could also become very sad and withdrawn. Naruto has always valued his relationships, and losing Hinata's love would be a huge blow to him. He might start to question himself and wonder what he did wrong.
Another reason could be that Hinata herself undergoes a significant transformation. Maybe she has a spiritual awakening or a change in her life goals that make her realize that her love for Naruto was more of an infatuation based on her younger self's ideals, and as she grows, she no longer feels the same way.
I'm not sure if there is such a fanfic. Cheating storylines in fanfics can be quite controversial as they go against the positive relationship often depicted between Naruto and Hinata in the original work.
It could be that Naruto has outgrown his initial feelings. As he matures, he starts to view Sakura more as a friend. In the fanfic, his experiences in the ninja world might have changed his perspective on love. He might have seen so much pain and sacrifice that he no longer wants to hold on to a love that might be one - sided or not as fulfilling as he once thought. Also, Sakura's continued love for Sasuke in the fanfic could be a factor that makes Naruto step back.
It's an interesting but also a bit of a disturbing concept. On one hand, fanfics are a place for creative exploration. But on the other hand, the naruhina relationship is so beloved that a cheating plot might make a lot of fans unhappy. It could also be seen as a way to add some dark drama to the story, but it's not in line with the positive and hopeful tone of the original Naruto series.
The plot may develop with Naruto finding new interests or friendships that draw his attention away from Sakura. He could become involved in a new mission or training regime that makes him see his relationship with Sakura in a different light. And as he pulls away, Sakura might start to realize she's losing him and try to win him back, but it's too late because Naruto has already made up his mind.
Communication is key. Naruto needs to sit down with Hinata and have an honest conversation about what's going on. He should explain his actions and feelings clearly.
In some Naruto fanfictions where Naruto hurts Hinata, it could be due to a misunderstanding. Maybe he's under some sort of mind - control or false information has been fed to him. This often leads to a lot of angst in the story.
One great 'Smart Naruto Naruhina' fanfic is 'A New Path for Naruto and Hinata'. In this fanfic, Naruto's intelligence is shown in a new light as he strategizes to protect the village and his relationship with Hinata. It has a really interesting plot that delves into how Naruto's newfound smarts can change the Naruto universe.
The dream might symbolize external pressures or expectations that Hinata perceives. It could also be a way for the author to introduce some drama and conflict into the story.