I've heard and read people saying that we say 'Sorry' and we apologize just because we want to feel better about ourselves. When you don't say you're sorry, you feel that you have to, to get it off your chest.
I don't agree when they say we say it to feel good about ourselves, maybe sometimes we do, maybe in some cases it involves that, but not in most cases.
I really believe that we say 'sorry' because we didn't mean to do something or we are really sorry and want the person to know that.
It's not because we want to free ourselves from that feeling upon one's chest of guilt for not saying Sorry. Even though I believe that we don't say it to feel better about ourselves, I can't be very certain about this. I believe in humanity, and maybe we're selfish, not everything in us is bad. I hope you understand what I mean.
I'd like it if you shared your opinion with me. :) Please do, so that maybe I can get a clearer perspective.