We all know that no human being can be labeled as perfect. In other words, we can say that nobody can be perfect and flawless. Because we are human. In our life we do lot of mistakes and then realize and self talking for example, "We shouldn't have done that, we shouldn't have made that mistake, we shouldn't have said them something wrong" etc.
If we feel our guilt, then we should reveal it and don't delay to do apologize publicly. If we can't, we should do it in another way which is appropriate and easy for us.
Human life has no guarantee and credibility because at any moment our breath can stop and we will leave this world. Therefore, if we have hurt someone intentionally or unintentionally, we should immediately apologize. Believe me, on such act of ours, we will find ourselves in relax mode.
I may have used some harsh words while texting or commenting, which might be hurt people, so I apologize to all of them. Apologizing does not diminish one's dignity. Those who respect, will do. And those who do not want to be honored will not.
We should love to forgive others because Allah Almighty also love forgiveness.