Yeah, if she never brought up Sasuke, it's obvious that he would have been "fooled". She just used to care so much about Sasuke, and Naruto also cares so much about Sasuke, to an inhuman degree. So that statement just sounds ridiculous. And maybe he doesn't even want to be with her if she has that view, who knows. I think what he wanted to hear was "I still want to save Sasuke, but you're the one I want to be with." Which Sakura was unlikely to say, given that the next thing she did was to try to kill Sasuke. She hasn't really worked through any of the feelings she has. She just knows that thinking about Sasuke hurts her but thinking about Naruto doesn't.
There's a strong possibility that Naruto didn't ever want to accept under these circumstances. He wanted to bring back Sasuke and have her pick him anyway because she loves him now. He doesn't want the feeling that he won just because Sasuke happened to be evil. It doesn't make him feel good about himself. So he doesn't want to comfort Sakura in this case and instead treats her like garbage... Rivalry? Because if he truly loved Sakura over all other people including Sasuke, he would never have done this.
"You didn't want to lose to him."
"By the way, you did lose to him, but don't worry about that."
In the end, it comes down to one simple problem...Naruto was too obssesed with Sasuke. This is the reason why people say Naruto has a secret homosexual fetish for Sasuke because of that obsession. The dude could never accept anything about Sasuke that he didn't want to. Naruto is almost as bad as the pro-enders...if you say anything bad about Sasuke...Naruto flipped his kitten...and not in "brotherly way" either. He did it in temper tantrums and hyperventilating. Who the hell hyperventilates over their friends being a douchebag?
I had a friend who became a douchebag too and I never once hyperventilated. Heck, the only time I came close to hyperventilating was when my fiance of 5 years left me because my mother controlled my life. I was extremely emotional, confused, and what not, but I still retained my senses. The worst I did was property destruction and lots of anger, but this was when my fiance broke up with me...NOT when my best friend treated people like kitten.
You know what I did after that? I secluded myself, spent time putting my life back together going from untterly not caring to making a promisee never to let my mother control me again like that. I didn't go after my fiance, I didn't obsess over her, I just let it go. Why couldn't Naruto do the same? Sasuke is a terrorist. He attacked and attempted to kill the Kages....that's terrorism. He threatened to control everyone and everything...that's terrorism.
All of this happened because Naruto could not let go.
People complain about Sakura's obsession, but in my mind Naruto was far more obsessed with Sasuke to the point that he dictated everyone's lives around him. Not just his own.
"Sakura you have to love Sasuke."
"Raikage, you have to let Sasuke live."
"Kakashi, you have to let me deal with Sasuke."
If it was me, I would be like,
"No, Naruto, I don't. F--- you and f--- your friendship. Sasuke made his choic and I am making mine. Sasuke has to be brought to justice."
"But...revenge is bad" Naruto would say. "How can we end the circle of hate?"
"Naruto. Shut up. You're trying to make it seem like I am the bad guy because I want to see justice for the families all because you don't want Sasuke to be hurt. F--- you."
"But...revenge...bad....no hate. I am begging you."
"Begging is for the weak. Did Sasuke stop when everyone begged him to stop? No. You want to stop me you're going to have to kill me. If you think Sasuke's life is more important than everyone else's, then you're going to have to kill me. I am not going to stop until justice is sought. If Sasuke puts up no resistance there will be no more blood shed, but if Sasuke chooses to fight then I have no control over what willl happen next. If I die, what will you do, Naruto? Will you see my life as my own choice or would you see Sasuke as the true cold blooded killer he is? I fight for justice. I will fight so that nothing bad will happen to people...at least not without punishing those who did the crime.Grow up."
Then go off looking for Sasuke. You never see characters like this. You never saw a character who was so adamant and so passionate about their goals like Naruto was obsessed with Sasuke. Everyone just fell for the TNJ every time.
You're going to run into people that are like "Well, too bad."