A lot of people concern themselves with grudges; who did what, how they were hurt, what they deserve, and the pain that was caused them.
But this takes a lot of time and emotional turmoil, which brings you down and limits your happiness. It’s stress that you don’t need, stress which can bring you mental and physical consequences. Life becomes easier when you learn to accept the apology you never got.
So instead of waiting for an apology, just move forward.