Things in our lives will not always go as planned. People and circumstances will disappoint you. Your political candidates will not always win the race. You will not always make the grades you want or land the job you were hoping for. You will not always maintain the relationships or friendships that you once had. During all of this, if you find yourself in a position to where you are upset, just let it go.
Everything happens for a reason. Life is all about surprises. If you live your life holding grudges, you will never prosper. You will be so indulged in what you do not like to where you miss out on the things that you do like. Not everything will go your way, nor will you always make the right decisions, but what you cannot do is let it be a constant problem in your life. You have to learn to let things go and leave things behind.
We cannot let anger control our everyday lives. People can get so caught up on people they do not like or people that have done wrong by them to where they miss out on everyday blessings. There is so much more to life than holding on to mess. Things happen. Count your losses and move forward. You cannot win them all.
"Let all bitterness and wrath and anger and clamor and slander be put away from you, along with all malice. Be kind to one another, tenderhearted, forgiving one another, as God in Christ forgave you." (Ephesians 4: 31-32 ESV)
We cannot call ourselves Christians, or followers of Christ, if we do not have a heart to forgive. God wants us to be disciples. He wants us to live like Him and bring others to know God. He wants people to be able to see God through us. If we are holding on to grudges, we are not living as Jesus lived. If someone does wrong to you, turn the other cheek. Two wrongs do not make a right. Living with bitterness and wrath only leads to a life full of misery. I have witnessed grown women be bitter and angry over something so simple as a misunderstanding during an innocent game. At some point, you have to stop being petty and start being mature. There is so much more to life than sitting around and being upset over things of minimal importance. If you cannot forgive your brothers and sisters in Christ, do not expect God to forgive you.
Life is so peaceful when you let go of the things that are causing you to have a problem with another person. No one wants to live like that. You do not have to befriend or reestablish relationships with these individuals, but I do advise you to forgive them and move on with your life. I learned a long time ago to easily forgive. No one should want a cloud of anger following them everyday because they are thinking about something that caused them dissatisfaction. You are better than that, and you have to live as such. Walk in a way that when people see you, they see nothing but an unimaginable amount of joy. This is how God intended for our lives to be. Anger is of the devil. The devil wants you to hold grudges. He wants you to be upset over petty drama. Don't let the devil win in your life. LET IT GO!