How can I help a person with an inflated ego? Or maybe you don't need to help at all then?

You had a friend Scaramouche, since high school, now you are 20 years old. He seemed quite right to you... Normal? But after graduation, everything changed.

He began to consider himself superior to others, and all people inferior. And even you. Although he hasn't done anything special in his life. He graduated from high school, never worked and lived at the expense of others. Because of all these humiliations, I wanted to give up everything and leave him, block him and never meet. But he wouldn't let you, even though you had a boyfriend. It was as if he believed that you belonged to him and everyone should obey him.

What are you going to do?