Naruto might initially be in shock. He's a person who values friendship highly, so being betrayed by Mirajane would be a huge blow. He'd probably first try to talk to her, to understand why she did it.
He could also feel angry and betrayed. Naruto has a strong sense of justice, and if he believes Mirajane has wronged him without a good reason, he might be tempted to fight back. However, his kind heart would still hope for a chance to reconcile. So he might hold back his full power and keep trying to reach out to her, to find a way to fix things.
Naruto might go into a bit of a self - doubt mode. He'd wonder if there was something he did wrong that made Mirajane turn on him. He'd start reflecting on their interactions and might try to improve himself in case it was his actions that led to the betrayal. At the same time, he wouldn't let this stop him from his overall goals, but it would be a major emotional distraction for him.
He might be initially shocked and heartbroken. Naruto has always valued his friends and the village's trust, so when that's suddenly taken away, he's in disbelief. He could try to reason with his friends at first, but when they don't listen, he might become angry and determined to prove his innocence on his own.
Naruto could also feel a deep sense of hurt. After all, he has been through a lot with Sakura. In the face of her betrayal, he might start to question his own judgment of people. However, being Naruto, he would not give up easily. He might try to find a way to redeem Sakura or at least make her see the error of her ways. He would draw on his own experiences of being ostracized in the past and use that to try to understand her actions and find a solution.
At first, Naruto would be extremely hurt. He has always considered Team 7 as his family, so their betrayal would be a huge blow. He might go into a state of shock and disbelief.
He could feel a great sense of anger and sadness. Naruto has a big heart, and being betrayed by someone he considered a friend or ally would be deeply hurtful. He might start to question his own judgment in trusting Mavis. And then, he would likely try to find out the reason behind the betrayal. He's not the type to just let it go. He would pursue the truth, whether it's to get revenge or to clear up any misunderstandings.
Naruto would probably be extremely hurt and confused at first. He would try to talk to his teammates, to understand why they are doing this. He might plead with them, asking them to remember their past together. But when he realizes they won't listen, he could become angry. Naruto has a strong will, so he would likely decide to prove his innocence on his own, vowing to show Team 7 that they are wrong.
He could also get angry. Naruto has a strong sense of justice and loyalty. So, being betrayed might fuel his anger, and he could set out to prove his innocence on his own. He might go on a journey to find evidence that clears his name and also to become stronger so that he can face his former teammates if they become enemies. He might also start to rely more on other friends outside of Team 7, like Shikamaru or Rock Lee, who might believe in him from the start.
He could then feel a deep sense of anger. Naruto has a temper, especially when it comes to those he loves. He might vow to find out the reason for the betrayal and make things right, or if it was truly malicious, seek revenge in his own Naruto - like way, which would involve trying to understand the person's motives even while being angry.
At first, Naruto would probably be extremely shocked and in denial. He has always looked up to Kakashi as a mentor and friend, so the idea of being betrayed by him would be hard to accept immediately.
At first, Naruto would likely be shocked. He has always been so loyal to his team, and this sudden betrayal would be a huge blow. He might stand there in disbelief, unable to process what's happening.
Naruto would probably be extremely hurt. He is someone who values friendship and trust deeply. So, he might initially be in shock and disbelief. He would likely feel angry too, but his anger might be mixed with sadness.