He was incredibly important, both to the galaxy as a whole and to Rey personally. While they may not have had romantic love for each other, they became close enough that Rey would miss him after his death. The kiss at the end of The Rise of Skywalker was a goodbye to a friend who would be dearly missed.
Kylo develops a close relationship with Rey and starts feeling genuine affection towards her, so when Snoke reveals that he had manipulated their bond and tortures her in front of Ren, he looks furious at his master. Thus, when Snoke orders Ren to kill Rey, he chooses to save her and kill his master instead.
He saw her as a useful tool for his rise to power. He was intrigued by the mystery surrounding her. He wanted closure for his defeat at her hands. He had a genuine emotional connection to her.
What is the connection between Kylo Ren and Rey? As Kylo Ren himself says in The Rise of Skywalker, he and Rey are bonded not just by their familial legacies (Ren as the grandson of Darth Vader and Rey as the granddaughter of Emperor Palpatine) but by their unique connection in the Force.
He was attached to her in a fearful and negative way; she was something for him to protect, rather than somebody for him to love. Ben Solo, however, was absolutely selfless after seeing the error in his ways and returning to the light. Ben used the ancient technique of Force-healing to give his life force to Rey.
Abrams described Kylo Ren and Rey as polarizing figures for each other. They are drawn to each other, their fates entwined, not because they are similar, but because they are such stark opposites. “They're stronger, but because each is stronger, so is their adversary,” Abrams said.
Throughout the sequel trilogy, Kylo Ren serves as the master of the Knights of Ren, a warlord of the First Order, and both an adversary of and romantic interest for Rey.
Rey is a palpatine and they planning to have her be the granddaughter of Obi wans younger brother from Stujohn so Rey is not a skywalker or biologically related to them. Although She is connected to the skywalker family through her grandfather Palpatine and her great uncle Obi wan Kenobi .
Not only did Ben care little for the Jedi, he also viewed Luke as the person keeping him away from his parents. And the strict rules of the Order only made matters worse, as Ben felt they limited his potential, and forced him to forgo attachments.
Rey and Kylo Ren's kiss was a goodbye to each other, not a romantic gesture. Rey's relationship with Kylo Ren was one of the most complicated in all of Star Wars. Their bond was extremely powerful, and Kylo Ren's return to the light side allowed them to defeat Palpatine once and for all.
Another moment in “The Rise of Skywalker” that generated a polarizing response is when Rey and Kylo Ren (Adam Driver) share a passionate kiss before his death.
The dyad is an unbreakable Force-bond that makes them one in the Force, despite being born as two physically separated individuals. Thus, despite not being related by blood, Ben is Rey's other half, making him her "soulmate" or "twin of the Force". As such, they were connected before they even met.
That Finn was going to confess his love for Rey based on a longstanding crush he's had on her pretty much since the first moment they met in The Force Awakens.
Although Solo was the last of the Skywalker bloodline, Rey assumed the name "Skywalker" to honor their memory, repudiating her own heritage as a Palpatine.
Kylo Ren dies on Kef Bir (the ocean moon of Endor) shortly after Rey deals a mortal wound during a lightsaber duel on the wreckage of the second Death Star. Though Rey Force-heals him, saving his life physically, this blow, coupled with the memory of his mother and father, destroys the man known as “Kylo Ren” forever.
Traditionally, yellow lightsabers are associated with Jedi Sentinels, who balance their combat skills with a strong focus on exploration and practical application of the Force. This choice reflects Rey's well-rounded training and her determination to maintain balance in the Force.
Luke's words confirm that Leia discovered Rey was a Palpatine during her lifetime, either before or during the time jump between The Last Jedi and The Rise of Skywalker. If Luke found out through his Sith investigations, or while training Rey on Ahch-To, he undoubtedly would've passed on this knowledge to his sister.
Admittedly, Rey skills couldn't possibly be as developed as Anakin's or Luke's. Nevertheless, considering how fast of a learner she is, and how unique the powers she possesses are, it's not a stretch to say that Rey could be a more powerful Jedi than Anakin and Luke Skywalker.
He gave it to Luke Skywalker, who lost it when Darth Vader struck off his son's hand in Cloud City. The lightsaber then became part of Maz Kanata's collection of Jedi curios, where it called to the scavenger Rey. She wielded it in defeating Kylo Ren, then brought it to Ahch-To and offered it back to Luke.
While the Skywalker bloodline is technically gone, Rey honors her fallen mentors, Luke and Leia, by adopting their family name. When asked who she is by the old woman on Tatooine, the former Palpatine declares herself Rey Skywalker, and she becomes a new part of the family.
This explains why Rey could hear the lightsaber "calling" to her in Star Wars: The Force Awakens; she was destined to join herself to the same Skywalker legacy, and thus she was sensing echoes of Anakin and Luke beckoning her to them.
