I don't think Kylo will ever get over killing Han. It was his younglings moment. Once he was the youngling he thinks was getting killed. Now he's the killer. He loved his parents, that much is clear.

Early in this film, he had a chance to destroy the bridge and Leia on it. He didn't do it. Others did it for him, but he didn't, couldn't press that button. She felt it, was ready for it. But no.

That's before he and Rey connected. That's Kylo. He loves Leia. That's what makes it all so complicated. Luke, Rey, Kylo, all the rebels, they love Leia and she's the emotional centerpoint for this film.

When Leia goes (and they had better write this well) that will be Kylo's last tether. He was going to destroy them all at the end but that was a child's blind rage. And he lost them. He tried to forge an alternate bond with Rey. But he lost her too.

It's okay, though. Rey will fight for him first. But her turning point will be like Luke's when she realizes she won't be able to get Kylo back. Not ever.

(I still think she's Kylo's sister. The friends I saw it with last night vehemently disliked this theory. But in the cold light of day I have never seen or heard of in a film, series, or animated series (haven't read any books) of any one having the strength in the Force that Rey has and not be in that family. Ever. Her connections with the Skywalkers them speak of family and the writer/director handled her connection with Kylo with a light hand this movie. So when she loses him for the final time, it's going to change her irrevocably because he's the last piece of family she'll have. Until she has her own kids.)