Boyfriends high metabolism.

I hate the fact that my bf can eat anything and stay fit and he doesn't exercise. Yesterday he ate twelve doughnuts and drank soda all day this is all he does is eat junk. Wish I had a high metabolism I look at a glass of water and gain 5 lbs. anyone else with the same problem? This is what he looks like. He should be big as a house. Sorry had to take a picture of a picture.