Things may have started to get out of hand for him. Someone was constantly behind Brandon, keeping an eye on him and it made him feel scared now. Paranoia was no longer in the angle.
Fear taken over, something that was driving him crazy.
Given that he was alone in this world, Brandon had no clue about who he was supposed to turn to. It overtaken everything. It was only the apartment that he felt safe inside, but Brandon knew that he had to go out every single day at least until he found an apartment and it frightened him of the idea that one day he would have to live alone with the feeling of being watched.
It was fucking with his brain, it was fucking with everything, and the fear was overtaking every single thing he did.