Adam has been in a Greek-type hell (i.e. doing endlessly repetitive, soul-sucking drudge work that never accomplishes anything) for so long he's starting to forget what it is to be human... so he can't figure out how it is the girl in the next hell over (Ruby, Bella, Jo, anyone) always goes around like she's still on earth. Maybe it has something to do with the fact she still has hope they'll get out of there eventually.