You are human, and you will make mistakes. Sometimes you will say something you did not mean or do something you will immediately regret, but that's life. You cannot change the past, but you can make a new and brighter future. There may have been times when you were a lousy friend, rude girlfriend/boyfriend, disrespectful daughter/son or annoying sister/brother. Learning how to say "I'm sorry," does not make up for everything you have done in your past, but it does indicate a level of humility and a sign of moving forward.
I understand that an apology can take some time. Some apologies are better after you step back, let the steam subside, and reflect on what happened. Sometimes it takes a long time to apologize to another individual because you may think they have wronged you and they should be the one to apologize. Swallow your pride and apologize. Be the better person because no one is guaranteed tomorrow. Think about it, would you want the last conversation to be an argument? Apologizing after an argument does not indicate weakness, but rather it exemplifies a sense of maturity. We are not perfect individuals, but we are called to love one another.
Swallow your pride and apologize. If the other person does not apologize for their actions after receiving your apology, move on. Try not to dwell on the fact that you did not receive an apology. Life offers marvelous opportunities, do not dwell on the little things.
Be Sassy. Be Sweet. Be You.
Classy, sassy, but oh so sweet!