Well in the manga when Hinata is striked down by Nagato(Pien)naruto goes in to six-tailed form//
after the fight,he didn't even bother to visit Hinata and ask her if she's ok...he jst accompanied sakura and then they met the kumogakure ninja along the way. if you will read the manga, you'll find out how much naruto cares for sakura.he even protected her fr.the kumogakure ninja(after the Pain invasion). naruto always looks at sakura whenever someone mentions sasuke's name...check out all the manga issues after his fight w/ pain..he comforted sakura when the enemy tried to interrogate them and asked them endless questions about sasuke's whereabouts.
another hint- sai told sakura the truth about naruto's feelings for her..if it's not important then why did kishimoto include it in his manga?(right after Hinata confessed her feelings for Naruto?) sakura was shocked when she found out tht naruto is still in love w/ her...she was so sorry when she learned tht she's causing him so much pain..