Their friendship deepens, leading to them becoming best friends.
Elena has admitted she sees the good in Damon and believes he's worth saving.
Elena begins to reciprocate Damon's feelings for her, though continues to love Stefan.
Though initially started on antagonistic terms, their relationship develops throughout the series.
He was the narcissistic evil vampire, who came to town to seek revenge on his younger brother, who Elena happened to develop an interest in.
He begins to fall for his younger brother Stefan's girlfriend, also Katherine's doppelgänger, Elena.