It turns out that Kakashi didn't kill Rin, but the story is more complicated than it appears. According to the Naruto fandom, Rin did ask Kakashi to kill her in order to save Konoha, her village. ... However, she wasn't able to take her own life and Kakashi didn't want to, either. In the end, Rin sacrificed herself.

Does Kakashi love Rin?

It has been confirmed that Rin has feelings for Kakashi. Although it is never confirmed whether Kakashi loved her in return, her feelings would further the already great remorse and anguish Kakashi felt over her death.

Does Kakashi regret killing Rin?

Rin leaped in front of Kakashi as he tried to slay an opponent with his Lightning Blade. Rin was not murdered by Kakashi; rather, he committed suicide with his help. ... Although it is never proven whether Kakashi loved her in return, her sentiments would add to Kakashi's already profound regret and sadness over her death.