It could be due to external pressures. For example, if there is some sort of threat or influence from an outside group that forces his friends to abandon him. Or perhaps Naruto has changed in some way that his friends don't understand or accept, like if he has developed new powers or a different personality trait that scares them.
One possible reason could be jealousy. Maybe Naruto has achieved something great and his friends are envious. Another reason might be a misunderstanding. There could have been some false rumors or misinterpretations of Naruto's actions that led his friends to believe he wasn't trustworthy or a good friend.
If you want the clearest chapter reference, go to Chapter 20. Early on, Several people turned their heads upon hearing the sound and saw three...; later, the chapter leans on She was clad in a long black dress, and the dull color did not hide her....
Look to Chapter 22 for the clearest answer. It begins with Hearing this, Su Yinwan looked at Shang Shaojing with a face full of..., keeps building through Shang, but it's not necessary;
The best chapter pointer here is Chapter 13, "Killing the Chicken to Scare the Monkey". It opens with Sensing that something was off with Jiang Yan, Jiang Yan dismissed the... and closes on How could this happen..." Lin Manru didn't want to hear any more of her....
If you want the clearest chapter reference, go to Chapter 13. Early on, Sensing that something was off with Jiang Yan, Jiang Yan dismissed the...; later, the chapter leans on What on earth do you mean?" Ignoring him once again, Jiang Li shifted her....
Chapter 871, "Emergency Incident", is the clearest early answer because it turns Xue Wandeng's situation into a concrete plot event. The chapter gives readers a real answer by opening on He really didn't expect such a coincidental event to happen to him.
Chapter 745, "I'm Pregnant", is the clearest early answer because it turns Fang Wenzhe's situation into a concrete plot event.
Chapter 881, "How to Deal with Her Few Younger Brothers?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After settling Jiang Li in the car, Zhao Lang fetched the medical kit...
Look to Chapter 12 for the clearest answer. It begins with Qin?" Jiang Li called out twice, and only then did Mrs., keeps building through Qin, who was standing by the dining table, respond., and lands on The glass shattered on the floor with a crash, attracting the attention of....
The best chapter pointer here is Chapter 12, "Drunk to the point of not being able to distinguish people after just two bottles?". It opens with Qin?" Jiang Li called out twice, and only then did Mrs. and closes on The glass shattered on the floor with a crash, attracting the attention of....