Remember the episode where he went into Elana's room and he basically poured out his heart her when she was in love with Stephan. Then, he made her forget. That is real love. He had to tell her but he couldn't tell her because she was in love with his brother.
'The Vampire Diaries' quotes: The best of season 5 http://sulia.com/channel/vampire-diaries/f/bef3ebfa-436f-41e7-bd60-3e85aab13cc4/?source=pin&action=share&btn=small&form_factor=desktop&pinner=54575851