Elena became a vampire and was sired to me. Then we discovered there was a cure. So we worked with Klaus to try and find it. Kol tried to stop us, because the cure was with the first immortal being, Silas, who was a complete douche. So, Kol compelled me to kill Jeremy because there was a map to the cure on his arms, Stefan managed to stop me and chain me up, and then Jeremy and Elena killed Kol when he tried to cut Jeremy's arms off.
We eventually found the cure, but Katherine ran in, fed Jeremy to Silas and then stole the cure. Elena broke down, and I had to get her to switch her emotions off, which broke the sire bond.
Eventually Elena switched her emotions back on, and concentrated on revenge. She shoved the cure down Katherine's throat. Then me and Elena got together properly with no sire bond in the way, making me think I was taking advantage.
Silas then locked Stefan in a safe, and sunk him in the ocean, because he's his doppelganger. Bonnie killed herself bringing Jeremy back from the dead.
We eventually realized Stefan was missing, and sort of found him. We killed Silas, and Amara the original female doppelganger, and made Bonnie the anchor to the other side.
The girls are now at college. Katherine died of old age.
Elena and I broke up.
So, I went and killed her friend Aaron, and then I wound up here.