Why doesn't Jonathan follow David?

1, both of them are mighty warriors, and they may become competitors and jealous of each other.

Because of this friendship, he had to face the painful choice of family and friendship. Jonathan was angry and abused by his father many times because of this friendship with David.

3. Jonathan is the son of King Saul. Later, Saul hated David and tried to kill him everywhere. He was afraid that his throne would be lost and replaced by David.