Often, Naruto is shown as being a bit slow to pick up on Hinata's jealousy. When he finally does realize, he might feel guilty. If he has feelings for Hinata too, he could try to reassure her. For example, he might start spending more time with her and being more exclusive in his interactions. He may also feel flattered that Hinata is jealous because it shows she cares about him.
In some fanfictions, Naruto is completely oblivious at first. He doesn't understand why Hinata is acting strange. He just goes about his day, being friendly as usual. But as Hinata's jealousy becomes more obvious, he might start to notice that something is wrong. He could be confused and try to ask Hinata what's bothering her.
Well, in some cases, her jealousy might make her pull away from Naruto. She could start avoiding him because she doesn't want to show her jealousy and risk ruining their friendship. For example, if she sees Naruto being friendly with another girl, she might stop going to the places where she usually meets him.
Hinata would be heartbroken at first. Naruto is someone she deeply cares about. But she's also a strong - willed ninja. So she might start by trying to understand why Naruto left. She could look for clues in the village or talk to Naruto's friends to figure out his possible destination.
Hinata would likely go to great lengths to save Naruto. She might seek help from the most powerful medical ninjas in the village or even venture out to find a rare herb or a mysterious healer. She would be in a state of shock at first, but then her love for Naruto would drive her to take action.
Sakura's jealousy might manifest through her actions. For example, she could be cold towards Hinata when she sees Naruto and Hinata together. Maybe she makes snide remarks or tries to insert herself between them more often.
Naruto might become more competitive. For example, if he sees Hinata spending time with someone else, he'll try to outdo that person in various tasks, like training or helping villagers. He could also get moody and a bit withdrawn, not his usual energetic self. It's his way of dealing with the unfamiliar feeling of jealousy.
It can initially create some tension. Naruto might act out in small ways, like being a bit short - tempered around Hinata. This could make Hinata confused and a bit hurt. But as the story progresses, it can also lead to more honest communication. Naruto realizes his jealousy is a sign of his deeper feelings for Hinata, and he finally confesses. This can strengthen their relationship as they start to understand each other better.
Jealousy can create misunderstandings. For example, if Naruto gets jealous, he might jump to conclusions about Hinata's actions and say something hurtful without meaning to. This could make Hinata feel sad and pull away from him, straining their relationship.
Hinata might be shocked at first. She is a gentle soul, so seeing Naruto be so violent towards Sasuke would be unexpected. But then she would probably try to stop Naruto, as she doesn't like to see people fighting. She might also feel a bit guilty, thinking that her relationship with Naruto somehow caused this conflict between the two friends.
On the other hand, Hinata's jealousy is depicted much more delicately. Since she's shy, her jealousy might be shown through her sad looks or small gestures. For example, she might lower her head or have a moment of hesitation when she sees Naruto with another girl. Writers often use her body language to convey her jealousy rather than big, obvious outbursts.
Naruto might be initially heartbroken. He is a character who values loyalty and love deeply. So, when he discovers Hinata's cheating, he could be in a state of shock and disbelief.