He did not jealously view David as a rival. Rather, Jonathan’s “soul became bound up with the soul of David ” as he pledged his loyalty to him.
فَقَدْ كَانَ ٱبْنَ ٱلْمَلِكِ شَاوُلَ ٱلْبِكْرَ وَبِٱلتَّالِي ٱلْوَرِيثَ ٱلْمُتَوَقَّعَ لِلْعَرْشِ ،‏ لَوْلَا أَمْرٌ وَاحِدٌ .‏