The head of the team of Doctors was Jerry, who is also Abby's father. ... In this process to save her, Joel kills Abby's father with a gunshot. This is the main reason why Abby hates Joel and she killed him to avenge her father's death. Now Ellie is set to take the revenge of Joel's death in The Last of Us 2 ending.

Why is Abby hated Last of Us 2?

Lots of people hate Abby in The Last Of Us Part 2 simply because she kills Joel. However, people also hate Abby because the game forces players to control her for nearly as many hours in The Last Of Us Part 2 as Ellie.

Does Abby forgive Joel?

At the end of the story they both grow as characters and forgive. Ellie finally has a positive flashback of Joel. She finally learns to forgive not only Abby and Joel but also herself.