Personally I wouldn't give somebody a key to my house after only two months...and, like i said, if you DO feel that way you tell somebody. If you don't it doesn't have to come up.
I don't think anybody who feels afraid at home alone at night is sitting in the dark waiting to shoot somebody. But they likely have the gun close by in case they're woken up. I had a creepy guy who lived in my building start leaving creepy and inappropriate notes at my door (when I hadn't even told him where I lived) and my cousin tried to give me a gun because I was so freaked out. If I'd taken it I wouldn't have sat up all night waiting to shoot the guy but you bet your ass if I woke up and he was standing in my room I sure as hell would shoot first and ask questions later.