Either way, no matter how it is translate, it still doesn't support Naruto changing his heart to Hinata. He makes nothing that he is trying or he tried. If it was about Hinata wouldn't he say he succeeded? To his viewpoint, Sakura still isn't officially his GF, but that he doesn't acknowledge Hinata as his GF either despite knowing full well that she loves him.
That's what I think, too. If he were certain about his feelings for Hinata, he'd have a more definite answer. Hinata's already confessed, and they had shared something important, when mourning Neji's death, so there'd be no doubt about her reciprocating any feelings that he could've developed for her. However, Naruto still called Sakura his girlfriend several chapters thereafter, and this took place in front of Hinata, might I add. If Naruto definitely did or didn't have someone, he would've been honest about it, especially because he was interacting with his dead father, his role model. It's since he was uncertain that he had such difficulty putting together an appropriate response, I think.