But, like for soldiers, it is NOTHING like watching and SEEING your friend bleeding to death and dying in your arms, as what happened with Neji and Naruto. Especially since Naruto had just earlier declared he wouldn't let anyone die, BELIEVED he could prevent anyone from dying. In earlier occasions, even when Pain stabbed Hinata, he didn't see the actual act. He didn't see Kakashi die in the Pain invasion. He didn't see Jiraiya die. He knows that he had no power to do anything when Minato and Kushina died for him. With Neji, it's different. Neji was RIGHT there with him, he probably was beating himself up for not being able to do something.
So IMO to talk about Naruto for a change, aside from all this pairing thing

Fair enough.
You know though, his reaction to being in shock is not what felt out of place, but the fact that he was willing to give up until Hinata slapped him. That felt really weird to me. It felt forced for him to just lose hope so easily like that. I would think he would be more pissed than depressed seeing how previous time he let his anger take control rather than give in to hopelessness.
I will say this, it would have been much better if he lost hope after Sasuke dies and Sakura snapped it out of him. Not just pairing wise, but emotional-wise. I just felt that a moment like this was wasted on this scene. It would have created much more drama if he lost hope over Sasuke dying.
Sasuke is closer to Naruto than Neji ever could be.