From the start, the eponymous yellow-haired protagonist was interested in Sakura, making every effort to protect her from danger and doing his best to help her with the missions. However, Sakura treats Naruto terribly, constantly hitting and insulting the child. All of her actions stemmed from her feelings for Sasuke, but she has committed two particularly disgraceful acts when it comes to mistreating Naruto.
In “Naruto,” Sakura earns the wrath of fans when she rejects Naruto in front of Sasuke because he grew up without parents. She taunts Naruto for being an orphan before Sasuke (also an orphan) by saying “He doesn’t have a normal childhood… He doesn’t have parents.” This irritates Sasuke for being able to empathize with Naruto’s loneliness and quite rightly chides Sakura for being “annoying”.
Later, in Naruto: Shippuden, Sasuke had gone rogue and was about to be fired because he was a lost cause to Konoha. However, the Nine-Tails Jinchuriki was determined to save his friend, so in Episode 206: “Sakura’s Feelings” the kunoichi “confesses” her feelings for Naruto so he won’t go looking for his friend. Even Naruto sees through Sakura’s disingenuous attempt to manipulate him, another moment that shows how badly Sakura treated him, all because of her feelings towards Sasuke.