I'm not sure if there is such a fanfic. Cheating storylines in fanfics can be quite controversial as they go against the positive relationship often depicted between Naruto and Hinata in the original work.
It's an interesting but also a bit of a disturbing concept. On one hand, fanfics are a place for creative exploration. But on the other hand, the naruhina relationship is so beloved that a cheating plot might make a lot of fans unhappy. It could also be seen as a way to add some dark drama to the story, but it's not in line with the positive and hopeful tone of the original Naruto series.
Hinata might be very hurt. She's a sensitive person, so Naruto yelling at her could make her feel small and sad. She might start to doubt herself and her abilities.
Naruto might be shocked at first. He could stand there frozen, unable to believe what he's seeing. His face would probably show a mix of confusion and hurt.
Hinata would likely become more independent. For example, if she was often relying on Naruto for emotional support, she'd have to find that within herself. She might become more assertive in the village, using her skills to protect it as Naruto did.
The dream might symbolize external pressures or expectations that Hinata perceives. It could also be a way for the author to introduce some drama and conflict into the story.
Yes, there might be such fanfictions in the vast world of fan-created content. However, this is a rather dark and non - canonical concept as Kushina is Naruto's mother and is usually depicted as loving in the original series.
He might be initially surprised. Naruto has always been a bit oblivious when it comes to romantic feelings. So, his first reaction could be shock, with his eyes widening and him stuttering a bit as he tries to process the new information.
At first, Naruto might be in shock. He has always trusted his friends, so the sudden betrayal would be a huge blow. He could be silent, unable to process what has just happened.
Sakura might be a bit surprised at first. But she would probably be happy for Naruto as long as he is happy. She might also be curious about the elf and want to learn more about her. Sasuke would likely be more reserved in his reaction. He might not show much emotion on the surface but deep down he would be glad that Naruto has found someone. Kakashi would probably give Naruto some sage advice about making a relationship work, especially since it's with someone from a different species.