What do I do if I'm starting to hate my best friend?

This kid, "Eric", and I have been pretty good friends for many years. But, in January, Eric was shot in a drive-by and his two best friends died. He saw everything that happened and is really upset by it. After his two friends died, I became his best friend. He moved in with me so he wouldn't have to worry about being shot again (I live in a much nicer area of town) and I help him with his homework. The only problem is that ever since Eric moved in I have started to hate him. He is super needy and clingy and gets his feelings hurt if I hang out with anyone else, even girls. He has shown up unannounced when I am on dates or hanging out at a girl's house. When I get mad at him, he just blames it on the shootings and not wanting to be alone. Also, he is a complete slob and already acts like he's been living at my house forever and makes huge messes and leaves his plates and stuff everywhere. It's gotten to the point where I avoid him at all costs, but he always finds me. What should I do? I feel bad and all because he's going through a hard time (his dad and grandpa were both murdered in the last year and his mom just got diagnosed with multiple sclerosis) but I'm starting to go crazy. What should I do?