I am sure that everyone has felt at some point in their lives that someone owed them an apology. I know for myself that I have been in situations where I have felt this way. Sometimes I have gotten those apologies, other times I have not and I am okay with that.
People spend way too much time waiting for apologies that they are never going to receive and being angry at the individuals that did them wrong. Life is so much easier when you can forgive and forget, even if the other person is unwilling to say they are sorry. It takes so much more energy to be angry at someone then to let it go and move on..in the long run you will be a much happier person.
On the other side of that sometimes you can say sorry and it's not enough and that needs to be okay too. People need to be more accepting that things do not always go the way they plan and roll with the punches that other people or life in general throw their way. Just some food for thought.