Sometimes in fanfictions, character development takes a dark turn. The friends might have their own personal goals that conflict with Naruto's. They could see Naruto as an obstacle to achieving those goals. Or perhaps there was a long - hidden secret that came to light, which made them change their attitude towards Naruto, leading to the so - called betrayal.
Another aspect could be influenced by external forces. Let's say an evil organization manipulates Naruto's family. They use mind - control or blackmail to make his family act against Naruto. In fanfiction, this can add a layer of drama and tragedy. It makes Naruto's journey even more difficult as he has to not only face external enemies but also deal with the betrayal of his own family.
One possibility is that Naruto could turn to the dark side. After being betrayed by his friends, his faith in the bonds he once cherished is shattered. He might start using his godlike powers for revenge, targeting those who wronged him. This could lead to a series of battles and a whole new dynamic in the Naruto universe.
In some fanfictions, Harry could be betrayed by friends due to jealousy. For example, if a friend is jealous of Harry's fame as the 'Chosen One'. Another reason might be a misunderstanding. Maybe Harry is wrongly suspected of using dark magic, and his friends, without proper investigation, turn against him.
In a fanfiction where Naruto is betrayed by his friends, it could start with jealousy. Suppose Naruto gets a great power or a special recognition. His friends, feeling overshadowed, might be tricked by an evil force into thinking Naruto is using them. So they betray him, which makes Naruto realize that he has to rely on his own strength and find new allies who truly understand him.
They could lose their home. If the betrayal is by the village, they would no longer be welcome there. They'd have to find a new place to live, which could be a difficult task as they are being hunted. They might end up in a hidden, desolate place where they have to start from scratch, building shelter and finding food.
In such a fanfiction, it could be due to a misunderstanding. Maybe Naruto was forced into a situation where he had to act against the Yugioh world for the sake of his own village. For example, if there was a threat to Konoha that was somehow related to the Yugioh realm and he was given no other choice but to 'betray' them.
Another possibility is a misunderstanding. Maybe some false information is spread about Naruto that makes Tsunade believe he has gone bad. In the world of Naruto, there are often enemies who try to create chaos by sowing seeds of distrust. Tsunade, without fully investigating, could fall for such a trick and seem to betray Naruto.
Another possibility is that Naruto has made a decision for the greater good that his friends don't understand at first. For instance, he might have to sacrifice something important that his friends think he shouldn't. So they react negatively and end up hurting Naruto with their harsh words and actions.
Well, it could be due to a misunderstanding. Maybe his friends were deceived by an enemy who made them believe Naruto was a threat to the village. So in a moment of confusion and misinformation, they took his life.
One possible way this could develop is through a misunderstanding. Maybe Naruto is framed for a crime he didn't commit, and his friends believe the false evidence against him. For example, an enemy could plant evidence that makes it seem like Naruto is working with the villains. His friends, not knowing the truth, turn their backs on him. This would lead to Naruto feeling extremely hurt and isolated, and he might have to go on a journey to prove his innocence on his own.