No one knows the true story of why he is how he is except for for two people.
July 1899.
Kol Mikaelson walked down the gravel path looking for a nice little human for dinner. Seeing that no one was really standing out to him he went in a bar. He ordered drink after drink growing more and more bored. But then he saw her. She has midnight black hair and vivid green eyes. "She looks like a tasty little thing". he thought to himself. He drowned his drink right down and walked over to her. "Hello my name is Kol Mikaelson and yours is" he asked her. She looked at him and said "Abigal now if you could moved out of my way". He smirked at her and said "Well thats a little rude Abigal but of course but we will see each other again".
He watched her walk away until he couldn't see here anymore. He smirked to himself thinking that this was going to be fun.
The next few days were spent with him watching her if he would ever see her around town.
The next 2 months were spent with him sweet talking her to give him a chance. After the 2 month mark she caved in.
It started off with him just trying to get her in bed with him but then it turned into so much more. Kol Mikaelson had fallen for a human. ANd that human was Abigal Dorton.
Kol Mikaelson and Abigal Dorton fell in love. She even found out that he was a vampire and she had still stayed with him.
But there was someone who didn't like the idea of Kol finding happieness in a human and that person was Klaus Mikaelson.