Now that they were getting closer to finding the cure for vampirism on "The Vampire Diaries," Damon's anxieties about Elena were coming to the forefront. He was terrified that her love for him might be entirely because of the sire bond. If that's the case, then as soon as she gets cured, she won't love him anymore.
Rather than face that possibility, he protected his emotions by pushing her away. He rejected Elena and the possibility of taking the cure himself -- though that latter may be genuine, as he's been a vampire for a long time and had a lot of fun with it.
"You know, I used to miss being human. Now I can’t think of anything more miserable on earth," he told Elena.
Back in Mystic Falls, Klaus showed some signs of humanity himself. Sure, he's one of the darkest characters the show has ever seen, but his feelings for Caroline seem to be genuine. After biting her and leaving her dying to try and teach Tyler a lesson, Tyler turned the tables on him.
He brought Caroline to the room Klaus was trapped in -- by a spell Bonnie cast last week -- and told him he could watch her die. It was a gamble that Klaus would not be willing to watch her die, but it was a gamble that paid off. Perhaps his one weakness has finally been found, and it's in the form of a perky, blonde vampire.
The quest for the cure continues on "The Vampire Diaries," Thursdays at 8 p.m. EST on The CW.
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