Forever Falling

After admitting he's a prototype, Lou spends his days in the supply shed, wallowing in humiliation and anger. He had the same dream as any other doll:to be loved by a kid. He could never receive that love. Why couldn't the other dolls understand that?
He was humiliated. He was disrespected. And after all the things he did for those dolls, all to be stolen by a bunch of stubborn socks.
Why can't he leave?
Why can't HE go to the Big World?