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.
Initially, Naruto would be heartbroken. But as he is a very resilient character, he would soon start to think about how to change the situation. He might go on a journey to become even stronger, not just for revenge but to show them that they were wrong. He could also try to find evidence or witnesses to prove that he is not the one who should be betrayed. He might even try to find a way to break whatever spell or misunderstanding is causing Team 7 to turn against him.
Naruto would probably try to figure out why they betrayed him. He's not the type to just accept it and run away. He'd confront them, asking for an explanation. And if they didn't give him a satisfactory answer, he'd likely be determined to prove his innocence. He might also feel angry and betrayed, but his positive nature would still make him hope that he could fix things with his team.