I had to pause and watch it again! That was heartbreaking! I still believeWilliam became what he became just for Love and not because he was that way deep inside. Outside of Westworld his company saved lives and created a world where all was curable except for death!

I think the Man In Black is living a lie, and keep repeating himself he is that evil, just because he's still hurt! Can you imagine falling in love with something that's not completely human? It scars you... He fell for Dolores and what she was and he believed her was becoming something else... He wanted to help her... Then, when he saw her again, she didn't remember him... He thought it was just him... That the park played a very sick game and made him believe that what he had with Dolores was real... So heartbreaking! But then she remembered him... she kept loving him... And when he found out it was too late! So sad! I really love William!

Also old!William basically said wanted the host to become more human, to make the park more real... I think deep inside he wanted them to be more human to get Dolores back!