If someone unjustly oppresses you, causes financial loss, hurts you, you must have pain towards him. And it is normal to have trouble towards him. A truly good man would not expect his loss as revenge. If you are a Muslim, then Allah will tell you to forgive him if possible. And that will be the greatest number. And if you don't want to forgive then you can say to Allah, Allah, you judge.
Now the question is why should you forgive someone who has harmed you.
There are many who cannot or do not want to forget the pain caused by someone from the past. Someone may have bullied you or misbehaved, many people harbor it in their hearts. And if you keep the jealousy and anger in your heart, it will burn you and teach you. But if you forgive him, you will find that your heart will be completely cold. That's why anger, anger, violence should not be kept in your heart. In the Muslim religion, if someone forgives someone, then Allah Ta'ala increases his honor and dignity.
If you choose the path of non-violence instead of the path of violence, it will be good for you. It is the act of a noble man to accept the apparent injustice done to you and avoid it with indifference. Striving for a better life with preparation in mind.