Re: Stefan S/Elena G.
Katherine IS responsible, I'm just [...] not sure that she knew the full extent of what would happen. Katherine always knows Katherine killed Bonnie.. I'm assuming to get at you, to hurt you.
Whether she knew that Damon's blood was in Caroline's system or not, I don't know. Caroline says that Bonnie is the one that insisted on Damon using his blood on Caroline, and now Bonnie has condemned her for it. Her hatred of vampires has blinded her, Elena.
Caroline needs you. She is still Caroline, and right now she needs a friend.