On this episode of The Vampire Diaries, Katherine pretended to be Elena in a talk with Damon and said they should remain broke up. This sent Damon down a dark path and he ended the hour by teaming with Enzo...
... and killing Aaron. Tough break for that kid.
Elsewhere, a Traveler completed the spell that placed Katherine permanently inside Elena's body, but Katherine chose to stick around because she has her sights set on Stefan.
Also, Tyler discovered Caroline slept with Klaus and did not react well to the news at all.
You are literally the best person I've ever known. And for me to think I could ever change you was giving me way too much credit and you way not enough… you're the good. And I need a little good in my life.Damon [to Elena]
Stefan: Define "out."
Damon: One who hovers and sticks his nose in other people's business. Wait... I was defining "annoying."