Okay, from the beginning. I met her, she was distinctly unimpressive, I was annoyed the guy I was in love with was in love with her, I told her if she hurt my family I'd kill her, she made various plots to kill me, blah blah, uneventful bitchy blah.
Then my mother happened.
My mother was a very powerful witch. Powerful enough to create us as the first vampires. Because she was basically crazy. Anyway, she died and spent a thousand years on the Other Side, plotting how to come back to life and how to kill the lot of us. So she did the first bit and the second bit involved a guy called Alaric Saltzman. Alaric had a ring that meant if anything supernatural killed him, he could come back to life. Pretty cool, except my mother used the periods he was dead to warp his mind and drive him crazy. He was a good man, and I am genuinely sorry he was caught up in my mother's schemes, I truly am. He deserved so much better from his life.
Anyway, as much as we all tried to stop it, my mother turned him into this unstoppable, immortal, utterly insane killer. Who had only one focus and that was to kill my family. And, as you know, when an Original dies, their entire bloodline dies with them. So Alaric was going to wipe out the entire vampire race, which was my mother's plan because she thought we were a plague on the Earth. She put in one single loophole in her spell. Alaric's life was linked to Elena's. He would live only as long as she did. So he had her lifetime to hunt down and kill my family. I saw him do what we all thought was the first move of that and kill Klaus. My unkillable brother. I truly believed he was dead, because certain witches called Bonnie didn't tell the rest of us she had done something weird with body swapping. As far as I and anyone else knew, Klaus was dead and Alaric was on his way to find me, Kol and Elijah.
Elena was fleeing town, I stood in the road leading out, for some reason Matt (who was driving) decided not to hit me with his truck but swerve and drive off the bridge. Which was a bit weird. My plan was to make the truck stop, grab Elena and snap her neck. But end result was the same, the truck crashed in the river and Elena drowned. Matt was rescued, luckily. And Alaric died on the spot.
Should have been the end of the story, except Elena annoyingly had vampire blood in her system so woke up. Really, my life would be so much simpler if she hadn't, but oh well. So yes, I technically killed her. She still whines about it. Of course, she always leaves out the next part. To complete the transition into becoming a vampire, you have to drink human blood within about 24 hours or you will die. She was trapped in a cage because of these weird hunter types, as was I and Stefan. I helped her get the blood of the guard so she would finish turning. So I killed her, I also saved her life.
So, we go back to bitchily sniping at each other. She pretends to hate being a vampire while going on feeds with Damon and shagging him all over the house because she dumped Stefan. Then this cure thing gets known about, she decides she wants it, she has Jeremy murder Kol in order to complete the Mark and tries this bullshit about doing it to protect Jeremy when that was actually a lie because there was a way to protect Jeremy without killing Kol and his tens of thousands of descendents.