S6E19 : Because

Wrestling with whether or not to tell Elena about the cure, Damon brings up their future together and what life would be like if they weren’t vampires. Meanwhile, it’s all hands on deck when attempts to stop a humanity-free Caroline doesn’t go as planned. Elsewhere, when Bonnie discovers that Damon has betrayed her trust, she takes matters into her own hands, setting off a chain of events that leaves Damon dealing with the fallout. Lastly, after being forced to face his traumatic past, Enzo sets out for answers and is surprised when he learns the truth about the day he was turned into a vampire.