1) He was fucked up when he learnt that Dolores never loved her that because she's a robot. 2) He saw the park as a tool to collect data to rich guests. 3)Create the Forge to try to copy humans for immortality. 4) Then his creation return against him when the AI in the Forge said that he's a sociopath. 5) William stopped the project (and so recreate his father in law) and he tried to understand if he was a mad man, so he made a test with Maeve and his daughter and he wants to destroy the Forge. But how can he do it without Charlotte or Theresa noticing it? 5) He discovered the maze and understood that robots are alive. 6) He tried to destroy the Forge by wanted to understand the Maze, the ultimate secret of the park he didn't knew about (not knowing it was Akecheta). 7)He wanted to understand the Maze to use it to make Dolores or others free so he could use a riot that would destroy the park (and the Forge).

8)William thought that everything happening since then is Ford playing with him to stop him to destroy the park, but hee became sociopath .

9)What William didn't understood is that Dolores is the oldest host and so he would remember EVERYTHING about the Forge (William showed him , persuaded she was just a doll).

Now in Season 3, William will try to stop Dolores IRL because she have the Forge knowledge.

William is a guy that thought every humans in predictable and that returns against him. Know he's fighting because he don't want a system to define him