AgE2theBONE said:
Jaime never wanted to be in the Kingsguard. Aerys did that to screw with Tywin. He did choose to remain in the Kingsguard many years later, after returning from his captivity, so he could be near Cersei but he was heir to Casterly Rock and would never have aspired to the Kingsguard with all their vows and sacrifices.
This is what it says on asoiaf.westeros.org
Now a knight, Jaime was to return to
Casterly Rock. He decided to stop in
King's Landing on route, to visit his sister, from whom he had been separated for years. There, Cersei informed him that their father, Lord
Tywin Lannister, intended to betroth him to
Lysa Tully, and had gone as far as inviting Lord Hoster to King's Landing, to discuss the
dower. Cersei suggested that Jaime become a member of the Kingsguard instead, replacing the recently-deceased Ser
Harlan Grandison. Though this would require Jaime to give up his claim to Casterly Rock and his position as Tywin's heir, it would allow him to be close to Cersei and free himself of the unwanted
marriage to Lysa. After a night of passionate sex, he gave his consent to Cersei's plan. While the siblings expected Tywin to oppose it, Cersei claimed he could not openly object. She promised to do the rest, and a month later, Jaime received news at Casterly Rock that he had been chosen for the Kingsguard, and was to present himself to the king during the grand
tourney at Harrenhal, where he would say his vows and don his cloak.[url=https://awoiaf.westeros.org/index.php/Jaime_Lannister#cite_note-Rasos11.7B.7B.7B3.7D.7D.7D-17][17][/url] Jaime's and Cersei's plan did not entirely work as expected. Their father, furious about the king's decision, pleaded illness and resigned his position as
Hand of the King. He returned to Casterly Rock, taking Cersei with him, which separated the siblings once more.[url=https://awoiaf.westeros.org/index.php/Jaime_Lannister#cite_note-Rtwoiafthe_targaryen_kings:_aerys_ii.7B.7B.7B3.7D.7D.7D-6][6][/url][url=https://awoiaf.westeros.org/index.php/Jaime_Lannister#cite_note-Rasos11.7B.7B.7B3.7D.7D.7D-17][17][/url]
Life is better with a beagle