Naruto might initially be in shock. He has always believed in his friends, so the betrayal would be a huge blow. He could try to reason with them at first.
At first, the village would be thrown into chaos. People would be speculating all kinds of reasons for his disappearance. His closest friends would be heartbroken and determined to find him. The elders of the village would be concerned about the political implications. Without Naruto, their main source of power and protection seems to be gone. However, some might also see it as an opportunity for a new era in the village, one that is not so reliant on a single individual, but this view would be in the minority at the start.
Sasuke would likely be conflicted. On one hand, he and Naruto have a deep bond, but on the other, Sasuke has his own ideas about justice. He might try to stop Naruto at first, reasoning with him. If that fails, he could be forced to choose a side, either to support Naruto's cause if he believes there's some merit to it, or oppose him to protect the shinobi world as he knows it.
Naruto could also be defiant. Given his strong - willed nature, he might not accept the banishment quietly. He may try to prove his innocence or the importance of his presence in the village. He could use his godlike powers to make a statement, not in a harmful way, but to show that banishing him is a mistake. For example, he might perform some great feats to protect the village from an outside threat even while banished, to show that he still cares about it.
Naruto would probably first try to find a peaceful solution. He has always been one to believe in the power of friendship and understanding. He might try to talk to the leaders of both villages, like Gaara in the Sand, to find out what's really going on and resolve the misunderstandings.
The village would likely be very happy. Naruto is a hero to them, and Hinata is from a respected clan. People would see it as a positive sign of new beginnings after the war. The children might look up to them even more, seeing a real - life love story unfold. Some might even throw a small celebration in honor of their relationship.
The village of Konoha would be in shock. Naruto is seen as a hero, but killing Sasuke, who was also a powerful and well - known ninja, would be a very controversial act. Some might support Naruto, believing he had no other choice for the greater good. Others would be angry and might even turn against him, thinking he could have found another way.
Sakura would be extremely angry at first. She has known Naruto for a long time and would feel betrayed that he didn't trust her enough to tell the truth. But later, she would understand his reasons and might even help him if she could.
He would probably be heartbroken at first. Naruto has always been someone who values his bonds with others. Being betrayed by the village he loves would be a huge blow. He might isolate himself for a while, trying to figure out what went wrong.
For emotional scenes in Infinity War fanfiction, just let your feelings flow. If a fanfic depicts a heart - wrenching goodbye between characters, like Steve and Bucky, feel the pain. Don't hold back. It's what makes the fanfiction experience so immersive.