Back in the early days when "Uchiha Sasuke" was a member of Team-7 he went with his fellow team-mates to the Chuunin exam, there he met a girl for a short time & saved her from a wild giant bear
Surprisingly; she is Karin, a fellow member with him in Akatsuki and from his team of Avengers, he was real nice to her back in those days
But he decided in his battle with Danzo since she is severely injured she is of no use to him, so he must get rid of her
Miss Karin is saved by "Haruno Sakura" who pretended to have the intention of killing Sasuke for being a traitor, but she wanted to do it alone so she decided to ditch her fellows since the previous chapter
Aawwhh, she does love him, but she's very stupid.
I guess what Meg told Herc in the Disney Hercules film that he told her again after saving her from death is true: "People do crazy things, when they're in love"