Stefan continuously tries to kill Elena but she begins to rely on Damon and is shocked when he's not there to save her, however, he promises to never leave her again. Despite telling Elena he no longer loved her, Stefan later confesses that he's never stopped loving her and wants to win her back.

Why did Stefan stop loving Elena?

Stefan and Elena formed a couple, more or less, in the first three seasons of the show. Stefan then broke up with Elena at the beginning of the fourth season because he came to realize that she had feelings for Damon.

Does Stefan ever kiss Elena again?

It was the beginning of an epic love story between Stefan and Elena. The one scene fans will always remember is in episode 10 when Elena accepts Stefan for being a vampire. Stefan was ready to let Elena go until she tells him she loves him. This causes tears in Stefan's eyes and returns to kiss her.