Pest noticed it and you noticed it too. The two of you were drifting apart and it hurt to see it happen.
It hurt Pest more than it hurt you, especially since you were one of the most accepting people he had met- how else did your relationship had go on for so long?
You were a people person- he was not. You liked to talk to others- he prefered to stay in his house, tinkering. You were honest, most of the time- he stole and lied like there was no tomorrow. Sometimes he wondered if there wasn't a tomorrow, that maybe losing you would just cause him to stoop to new lows.
He didn't want a repeat of Macabre City.
You were the one piece of positivity in Pest's life and he wanted to keep it that way, but he was unsure of what to do. He didn't want to keep you trapped and he would let you go if you really wanted, but he wasn't sure what he wanted. Sometimes he missed doing things on his own and not having to fend for another person, yet he liked coming home to you rather than a den full of dolls, robots, and coins strewn about because he had no motivation to clean it ever.
Pest let out a sigh and looked over his shoulder at you, who was cooking something for dinner. He watched the way you moved and the way you listened to music and the sounds of the food being prepared. You acted like it was innate and that you were used to doing it because you did it so much. He wouldn't do that- he would probably just order take-out or starve. He felt like the moon, not being able to do anything unless the sun was looking at him. You were his sun.