The best apology is changed behavior.
I'm sorry,often a blank Ward that l would exchange for Thank you that you are in my Life,for friendship and all that is good.
Sorry is hard to say for a lot of people. Changing your actions for what you are sorry for, what hurt that someone special is the very best apology. They will notice whether it's said or not.
Without changes behaviour from both sides means no apology.
People don’t wake up changed seem we ourselves have to change. Put up or get out. All about choices.