Shikamaru, being the more laid - back but perceptive friend, would likely be disappointed. He might see the signs that led to the divorce coming from a mile away but feel powerless to stop it. He would probably just sigh and say something like 'What a drag' while still being there for both Naruto and Hinata as a friend.
Sakura would be really happy for them. She has seen Naruto grow and has always wanted him to find true love. Since she has moved on from her old feelings for Naruto, she would be supportive and might even offer to help with the wedding preparations. Shikamaru would probably be a bit lazy about it at first, but deep down he'd be glad for Naruto. He'd say something like 'What a drag, but if it makes you happy, Naruto.' Kiba would be excited, especially since Hinata is his teammate. He might tease Naruto a bit about finally getting the girl.
His friends would be really happy. Shikamaru would probably be like 'Well, it was bound to happen eventually, Naruto.' and offer some practical advice. Choji might bring over some delicious food for Hinata to help with her pregnancy cravings. Kiba would probably joke around with Naruto about how his life is really changing now.
Kiba would probably be shocked. He's Naruto's friend and also has a connection to Hinata. He might try to convince them to stay, saying things like Konoha needs them. But once he realizes they are determined, he would support them in his own way, like promising to visit them. As for Lee, he would see it as a very brave decision. He would be inspired by their courage to step out of their comfort zone and start a new life elsewhere.
Their friends would be overjoyed. Sakura would probably be really excited and offer to help Hinata with any medical advice during the pregnancy. Shikamaru might give Naruto some practical advice on how to handle the added responsibilities. Kiba could be really happy and joke around about the new baby being a future ninja partner for his own pups. And Ino would be eager to plan a baby shower for Hinata, full of beautiful flowers and gifts.
Sakura would probably be really concerned. She has known Naruto for a long time and would want to make sure he's okay. She might try to talk to him and get him to open up about his feelings.
Sakura might be initially shocked but then understand Naruto's decision. She could secretly help them by providing medical supplies. Shikamaru, being the smart one, might predict their actions and try to cover for them so that the village doesn't find out too quickly.
Naruto would probably be extremely hurt. He has always considered Hinata a friend and perhaps more. Betrayal from her would be a huge blow to his trusting nature. He might initially be in denial, not wanting to believe that Hinata could do such a thing.
At first, Naruto would be completely shocked. He has always seen Hinata as a loyal friend and someone who has deep feelings for him. So the idea of her betrayal would be hard to fathom. He might try to deny it at first.
He would be filled with rage. Naruto has a strong sense of justice and the fact that someone took Hinata away from him would fuel his anger. He would vow to find and punish whoever was responsible. He might even become reckless in his pursuit of vengeance, endangering himself and those around him. His friends would have to step in to try and bring him back to his senses.