Ever since Hope had been taken and sacrificed, Klaus had seemed like a ticking time bomb. He had chased his siblings away; Rebekah was in Europe travelling with Marcel, while Elijah was teaching music and history at Yale. They stayed in touch with Cami, sending postcards and letters always asking about their brother but they stayed away. They were probably afraid Klaus would dagger them, they were all shocked when he hadn't done so in the first place. In fact by letting his siblings go on and live their lives without him, had shown to Cami just how broken Klaus really was, he didn't even have hope that he could create a loving family anymore.
Klaus spent his days painting and drinking, he drank until he was drunk, which was a lot considering he had a 1000 year tolerance and he was a hybrid. When he drank, he would invite tourists into his home for a party, slaughtering them all by the end of it. He had become even more quick-tempered than before, killing almost anyone who annoyed him. Cami was actually surprised he hadn't killed her, there were times he had came close, when she had tried to get him to talk, to open up.
But this girl, Lily was having a huge effect on Klaus, Cami thought as they walked back to her place. Today it was like he was himself again, still paranoid and narcissistic, but himself nevertheless. Lily must be special Cami thought, the poor girl didn't even no what she had gotten into in or the effect she was having on the worlds strongest creature.