In my opinion, the whole 'you have to forgive the people who did you wrong to be able to move on' idea is bullshit and harmful to victims. You do, however, have to forgive yourself for not being able to stop the bad thing from happening.
When he went deaf it took me two years to realize it and it was only because someone pointed out out to me that he never moved the direction of his ears. It didn't change his behavior at all! He already didn't pay attention to what was going on around him! A simple cat, with a simple lap life.