I firmly think naruto was told by the great toad sage that he'll die in battle protecting the world.
He's not been worried about relationships or even getting sakura to like him and date him. His maturity rapidly increased.
He told sasuke if they fought they'd both die. The toad told him he'd fight a young man with powerful eyes but the rest of the prediction was cut off. Naruto obviously thought of sasuke so it only makes sense the rest of the predictions was that he'll face a man with eyes and they both die.
In my opinion the man is either obito or sasuke and both obito and naruto will die by ridding the world of the juubi. Then sasuke will become hokage and continue naruto's legacy.