My bf wants too much.?

everytime he wants something he mopes and whines til he gets it, then its off to the new want or need and the other thing id left n the dust. Pets, hair products, video games, magazines, food, dvds, movies, etc. its all the same. He mopes if u tellm no, he gets mad if u mention the lack of money, urgg what do I do. He is an only child and used to getting everything he wants