Damon begins to doubt her feelings for him and believes they are solely built on the sire bond.After being compelled by Rebekah to tell the truth, Elena reveals that she is no longer in love with Stefan and is instead in love with Damon.
She tries to be friends with him but he refuses and they try to avoid one another which turns out to be impossible.After getting kidnapped by Markos, nearly dying and with a little encouragement from Stefan she tells Damon that she thought she would never see him again and couldn't think of a worse way to die and so they both rekindle their relationship.He begins to fall for his younger brother Stefan's girlfriend, also Katherine's doppelgänger, Elena.His love for Elena makes him want to protect his birthtown instead of destroying it, as was his original purpose when he arrived. Elena constantly forgives Damon from doing horrible things to her, such as killing her younger brother Jeremy (although he came back to life) or feeding her vampire blood (essentially ending her human life).Elena later chooses between Damon and Stefan for the second time, this time choosing Damon, since she had fallen out of love with Stefan.
She confirms her love for Damon during a heartfelt confession from them both, and they kiss.
For him, she is the best thing that has ever happened to him, his life. Basically, there’s something about people coming together in the rain that’s the ultimate expression of love in the minds of most audiences.""The show was so Delena-heavy.
For her, he is the one that defines her, her soulmate. And their love was such an epic love and such a big story point for so many years that it's a strange dynamic now to have all that gone.
She later confesses this to him, stating that it's the most real thing she's ever felt.
After Jeremy dies, Damon uses the sire bond to get Elena to turn her emotions off, knowing that the pain would be too much for her.
Elena has admitted she sees the good in Damon and believes he's worth saving.