I lived with my dad briefly and when I moved I had to leave my cats for several months. I can't imagine what you are going through knowing it will be a year. Just try to focus on that this isn't forever. This is probably going to sound stupid but will your friend let you Skype your cat? Then you could still see him and know that he's ok. My heart goes out to you. I know how much it hurts to be separated from a pet.