Nate got it right guys...
Naruto is being a selfish little b*tch right now. Sasuke is beyond help at this point! I hate how Kishi is putting him up because when the boys fight Naruto will be crying his ass off while Sasuke is like "you dumbass leave me alone or you don't know kitten about me".
You know Naruto is becoming a sad character

... I mean seriously
he 's so focus and depress on the friend he lost but what about the friends whose been by side? When the time comes will he sacrifice his friends for Sasuke?
At least point at least Sakura is starting to make some sense of reality and maybe the only one who can open Naruto's eyes. Hearing Sasuke is evil from enemies (and friends) are one thing but hearing hearing it from he woman you love is totally a different ball game.
There is an explanation for why Naruto showcases an "obsession" with Sasuke. It all has to do with Kishimoto's editors and appealing to the yaoi market to increase sales on the manga and merchandise. There is no hiding the fact that SasuNaru is an insanely popular shounen-ai pairing in Japan and it just doesn't spur from them sharing a bond and being friends. Is Luffy/Zoro a really popular pairing just because they are nakamas? Is Ichigo/Grimmjow a really popular pairing because they are rivals? Why is it that SasuNaru is so popular if it isn't for the subtle hints that Kishimoto puts in the manga. Naruto's constant thoughts about Sasuke where he is seen thinking about him, crying over him, and even begging for forgiveness on his behalf. This grows to the point of unhealthy obsession from most peoples perspective, but those who are yaoi fans see this as romantic clinging about two people who are separated by opposing themes and to see them finally "unite" would showcase the powerful bond of love--or as it supposed to seem as friendship.
I constantly see this talking about the "bond" they shared and friendship but when I really look at it where are the examples to show this? Naruto was an orphan and by himself when he was young so he had no friends. It wasn't until the formation of Team 7 and during the Wave Arc with the Haku fight did we see a sign of growing friendship between the two. But after that...where are the examples of friendship and bond? As soon as Itachi shows up Sasuke is hellbent on revenge and breaks the bonds he was starting to form. Sasuke gets jealous after Naruto showcases his ability during the fight against Gaara and from then on they fought on the hospital rooftop right before Sasuke makes his exit. Then we have the eventual first retrieve Sasuke arc which lead to Sasuke/Naruto fighting and Sasuke making his eventual departure and separation for three years. So..in all this time where does this unbreakable bond form? Where excluding the Haku fight do they suddenly become best friends and go through trials and tribulations together? What articulates Naruto having such a strong obsession with saving Sasuke when they spent so little time together?
An example of a valid obsession with one person I can understand is between Guts and Griffith from
Berserk. Griffith was someone Guts idolized and looked up to for many years. When the eventual Eclipse takes place and Griffith destroys everything that is precious to Gutts, by brutally killing all his close friends, raping the woman he loves right in front of him, and branding him with a mark that have demons chase him until they drag him to the depths of Hell. This strong development makes me understand and reasonably believe Gutts obsession with Griffith and hunting him down since it portrays the many years they spent together and the severe toll it takes on Gutts both physically and emotionally. But with Naruto and Sasuke I look and see nothing that comes close to giving a reasonable reason as to why Naruto must save Sasuke so badly when he left on his own accord and cut off his bonds. The only reason for why Naruto is seen as mulling over Sasuke is so badly is because of the subtle yaoi hints that appease to a particular fanbase.
Now don't get me wrong, I have no problem with this at all. Kishimoto and WSJ don't make this manga just for fun but to make money. So if they decide to appeal to a certain fanbase so they can increase sales and Naruto related merchandise what's so bad about that? It is just a type of fan service that is no different than having females with looming physiques as well as bishie-type males as seen in
Bleach or
Negima?! where the mangakas put it in for the pleasure of their readers. I know I'll get the "this is a shounen manga and yaoi is not going to be canon" but I've never claimed that. It's seemly subtle hints that are cleverly placed in and up to the readers to interpret--some of us who will just call it friendship while others who will call it romance-- for us to identify and form our own opinions. This is just my explanation as for why Kishimoto has constantly shown Naruto mulling over Sasuke and his "obsession" with him ever since part 2 started and why it doesn't bother me anymore.