If you intend to continue, and he tells "What is the most important thing, is there anything worth fighting about!" So his fate was determined by him. So how interesting and valuable is his life? There's not much we can do to change him. How can you make him positive and excited about life even though he doesn't want to feel it? You can feel comfortable walking by the beach, enjoy the taste of butter in your mouth... All these joys are always waiting for you. But it's up to him to accept it or not. It all depends on us when we enjoy every walk on the beach, every bath, every time we eat an apple, every time we talk, every time we listen to music... We feel the new, the good and the interesting. Its different every time... not exactly the same.