The rules that do apply here in regards to criminal behavior is that he has probably killed Gabby in a violent manner, dumped her on the side of a road and left her there, and has so far not given any details of what happened. He’s not odd, he’s just an everyday loser and killer who went on a trip with his girlfriend and expected her to coddle him the way his parents have. Gabby, on the other hand, was an ambitious young lady who was working and documenting their trip so she could show the world her artistic skills. His only ambition these days is trying to figure out how long Mama’s apron strings are.