Elena to Damon: “I’m here until the very end. I’m not leaving you!”
The Vampire Diaries 2x22 “As I Lay Dying”

Elena to Alaric (about Damon): “We can’t leave Damon! […] No, if he gets bit, he’ll be dead! I’m the reason he’s out here!”
The Vampire Diaries 3x02 “The Hybrid”