He could be angry. Naruto has a temper, and being cheated on by Sasuke would likely make him furious. He might even want revenge.
Naruto might be heartbroken. He's a very emotional character, so he could cry a lot and feel a deep sense of loss.
Naruto could also be deeply hurt and go into a state of self - reflection. He might question his own judgment in relationships. For example, he could think about what he did wrong or if there were signs he missed. This could cause him to leave to find himself and grow stronger on his own. He may start to focus more on his ninja training and his friends in the village, trying to move on from the pain of being cheated on.
Some fans might be outraged. Naruto is a beloved character, and the idea of him being cheated on by Boruto goes against the positive father - son relationship they expect. They would see it as a distortion of the characters' true natures.
Fans would likely be divided. Some fans who like exploring unconventional and darker storylines might be interested in such a fanfic. They might see it as a creative exploration of the characters. However, many fans who are loyal to the original relationships in the Naruto series would probably be outraged. They would feel that it goes against the essence of the characters and the positive relationships that were built up over the course of the series.
There would be a lot of shock and disappointment among fans. Naruto and Hinata are a beloved couple, and fans who have followed their story would find it hard to accept such a plot. Many would probably criticize the author for going against the essence of the characters.
If Naruto gets cheated on by Sasuke in a fanfiction, it could greatly disrupt the traditional bond between them. It might lead to Naruto feeling betrayed and could potentially make him more cynical. This could change the direction of the story, perhaps leading Naruto to focus more on his own self - growth rather than their relationship.
One possible plotline could be Naruto's initial shock and disbelief. He might go through a period of self - doubt, wondering what he did wrong. Another could be his journey to find himself again after such a betrayal. He might focus on his ninja training more intensely to distract himself from the pain.
Yes, there are likely fanfictions out there with such a plot. Fanfic writers often explore different and sometimes controversial storylines. However, this goes against the strong bond between Sasuke and Naruto in the original series.
There could be many interpretations in such a fanfiction. Maybe it shows Naruto's vulnerability in relationships. It might be a way to explore his character deeper by putting him in a difficult emotional situation.
Naruto might be initially shocked and heartbroken. He is someone who values loyalty and friendship deeply, so being cheated on would be a huge blow to him.
In such a fanfic, Naruto might first feel extreme betrayal. He has always considered Sasuke a close friend or more. If Sasuke cheats on him, he could feel that his world has crumbled. He might initially go into a state of shock, unable to believe what has happened. Then, the thought of suicide could creep in as he might feel that there is no one left to trust or that his life has lost its meaning without Sasuke's loyalty. However, Naruto is also a strong - willed character, so he could also choose to rise above it and prove to Sasuke and himself that he doesn't need such a person in his life.