Self - reflection is key. If Naruto takes the time to really look at himself and understand why he closed his heart in the first place, he can start to work through those issues. Maybe he realizes that closing his heart is only causing him more pain in the long run and that by being open, he can experience the full range of human emotions again, both the good and the bad.
It could also be due to the constant pressure and expectations on him. He's always had to be the hero, the one to save the village. If he feels he's constantly failing or not living up to those expectations, he may close his heart to protect himself from that self - doubt and disappointment. In the fanfic, perhaps there are new threats to the village that he feels he can't handle, and this leads to him shutting down emotionally.
Perhaps after facing too much betrayal from the village he loves. If the villagers turned on him despite all his efforts to protect them, it might lead him to close his heart in self - defense, not wanting to be hurt again. He's always tried so hard to gain their acceptance and if that was all for naught, it would be a huge blow.
In some fanfictions, Naruto could break Hinata's heart by choosing another girl over her. For example, if he decides to be with Sakura instead. Hinata has always had deep feelings for Naruto, and seeing him with someone else would shatter her heart. It could also be that Naruto ignores Hinata's sacrifices for him and takes her for granted, which slowly breaks her heart as she realizes he doesn't value her as much as she thought.
Well, it might start with Naruto distancing himself from his friends. He stops going on missions with them, and he doesn't show up at their usual gathering places. For instance, he might avoid Ichiraku Ramen, which was always a place of connection for him and his friends.
One consequence could be that Hinata tries to move on but struggles a great deal. She might have a hard time opening up to anyone else in the future. Her self - confidence could also take a big hit. Since she put so much of herself into her feelings for Naruto, having her heart broken could make her question her own worth. Maybe she starts to think that if Naruto didn't love her, then no one will. This could lead to her being more reserved and less likely to take risks in relationships or in other aspects of her life.
Another possibility is Gaara before he met Naruto. He had a really tough childhood and was initially very cold - hearted, seeing others as tools or threats. His heart was like a frozen desert, until Naruto's friendship started to thaw it. In this fanfiction, they could explore more of his pre - Naruto state of a frozen heart and how it affected his relationships with others in the shinobi world.
Naruto might become more withdrawn. He's used to being this energetic and positive person, but after having his heart broken by Hinata, he could lose that spark. He might stop going out as much, avoid his friends, and just keep to himself.
There were novels similar to Naruto:
1:"The Ming Dynasty Can't Die", Author: Key Big Shot
2." Immortal Cultivators Pass Through the Apocalypse, I'm Overjoyed as a Demonic Cultivator." Author: Tower of Eternal Light
3: Fairy, Your Character Set Has Been Changed by Me, Author: Old Man Dong
4." Cultivate and Cultivate in Troubled Times ", Author: Changhong Jushi
The following is a detailed introduction of these novels:
1." The Ming Dynasty Cannot Die ": Cross the Ming Dynasty and become Zhu Youjian.
In order to avoid the tragic end of Zhu Youjian, he could only work hard to make the country prosperous, develop and reform, and rejuvenate the country through science and technology!
In his hands, Da Ming absolutely could not die.
And he could not be the ruler of a subjugated country!
2." Immortal Cultivators Cross Doomsday, I'm Overjoyed as a Demonic Cultivator ": As a transmigrator, it seems that I've already received it.
In the center of his sea of consciousness, there was an ancient door.
Wu Ping tried to enter with a trace of curiosity.
However, when he entered, the scene in front of him suddenly changed.
Everything around him changed.
This place was already in ruins, and there were tall buildings everywhere.
He looked at the skyscrapers of the city.
Wu Ping was in a good mood.
Could it be that he had returned to his previous life?
If that was the case, then he would be the only self-cultivator in this city.
Thinking of this, Wu Ping became excited.
However, Wei Xiao Bei quickly discovered a Zombie.
Wu Ping was dumbfounded.
In order to find more information, Wu Ping fled to a fallout shelter.
Later on, he discovered that the change in this world actually began from the night he entered this space.
3:" Fairy, I've Changed Your Character Setting ":" Fairy, I've Changed Your Character Setting."
"It's true.“
4." Cultivate and Cultivate in Troubled Times ": In the vast cultivation world, human lives are like grass!
Wang Feihong transmigrated to Mingtong City Square and became an older immortal cultivator youth. He relied on hard labor to survive.
Until one day, the little black gourd that had transmigrated with him mutated.
There were a hundred mu of ling fields inside the gourd. A year inside was equivalent to a day outside.
[This is a sure thing!]
Wang Feihong held the gourd excitedly, as if he had seen hope…
You can read these novels on Qidian Chinese Network.