my headcanon about the doppelgangers is that they always gravitate toward each other not romantically exactly but they feel a pull that makes want to be in each other's orbit that's why Katherine immediately went after Stefan when she saw him and even tho Stefan was compelled at some point into a relationship with Katherine and by all rights her face should disgust him after what he went through he still fell in Elena's orbit, we see them almost going back to it when Stefan lost his memory














