A strong feeling of anger and dislike for a person who feel has treated you badly, especially one that lasts for a long time is Grudge.
How to overcome it??
Seek repentance and pray for God’s help in forgiving the person. God’s help is clear that if we expect to receive forgiveness from God, we are accountable to forgive those who have wronged us (Matt 18:21-35; Luke 6:36).
In Leviticus 19:17,18, we see
“Don’t secretly hate any of your neighbours. But tell them openly what they have done wrong so that you will not be just as guilty of sin as they are. Forget about the wrong things people do to you. Don’t try to get even. Love your neighbour as yourself. I am the Lord.
Luke 6:27-36, tells us
I say to you people who are listening to me, love your enemies. Do Good to those who hate you. Ask God to bless the people who ask for bad things to happen to you. Pray for the people who are mean to you. If someone hits you on the side of your face, let them hit the other side too. If someone takes your coat, don’t stop them from taking your shirt too. Give to everyone who asks you for something. When someone takes something that is yours, don’t ask for it back. Do for others what you want them to do for you. “If you love only those who love you, should you get any special praise for doing that? No, even sinners love those who love them! If you do Good only to those who do Good to you, should you get any special praise for doing that? No, even sinners do that! If you lend things to people, always expecting to get something back, should you get any special praise for that? No, even sinners lend to other sinners so that they can get back the same amount! “I’m telling you to love your enemies and do Good to them. Lend to people without expecting to get anything back. If you do this, you will have a great reward. You will be children of the Most High God. Yes, because God is good even to the people who are full of sin and not thankful. Give love and mercy the same as your Father gives love and mercy.
Ephesians 4:25-32, teaches us
You must stop telling lies. “You must always speak the truth to each other,” because we all belong to each other in the same body. “When you are angry, don’t let that anger make you sin,” and don’t stay angry all day. Don’t give the devil a way to defeat you. Whoever has been stealing must stop it and start working. They must use their hands for doing something good. Then they will have something to share with those who are poor. When you talk, don’t say anything bad. But say the good things that people need whatever will help them grow stronger. Then what you say will be a blessing to those who hear you. And don’t make the Holy Spirit* sad. God gave you his Spirit as proof that you belong to him and that he will keep you safe until the day he makes you free. Never be bitter, angry, or mad. Never shout angrily or say things to hurt others. Never do anything evil. Be kind and loving to each other. Forgive each other the same as God forgave you through Christ.
My friends don’t try to punish anyone who does wrong to you. Wait for God to punish them with his anger. It is written: “I am the one who punishes; I will pay people back,” says the Lord. (Romans 12:19)