Ethical solipsism

Ethical solipsism is a type of belief system that says that only one person or thing exists, and that person or thing has no obligation to think about anything or anyone else. This means that the only thing that matters is what they think or want, and they don't have to worry about other people's feelings, beliefs, or actions. It's like if you are the only person in the world, so everything only affects you and no one else.