Head cannon that portal 2 takes place over the coarse of a long period of time and Wheatley helps Chell survive
like he helps her find food or clean water so she doesn't die between tests and he shows her old nooks and crannies where Rattmann was and he tells her where to find unopened cans of beans and such. also he disengaged himself from his management rail multiple times and kept chell company while she slept










