It is not merely as bad as you make it out to be. He was jealous of Naruto's growth, but that was only once out of control, in the chuunin exams and the aftermath of what happened there. The rest, in the end for example, is a very mutual rival relationship between two boys eying eachothers new power.
He was jealous of Naruto's growth the entire time, it didn't just happen one time, it was a constant continuation. Hell, the reason he put Itachis eyes in his skull was because he was jealous of Naruto and wanted to crush him.