in the second dimension, there are flat versions of carl and riley, unnamed, but with similar circumstances. after about six months of being broken up, they decided to get back together which really didn't turn out the way either of them wanted it to. they got married anyway, at the age of 23, fresh out of college with new hopes and aspirations. since they lived in the second dimension, their house was just a drawing on a sheet of paper. when one was punished in the second dimension, their house would either be erased, or located to a sheet with lines all over it.

anyway,
here is their final conversation together (2 years into marriage)
flat carl: "i'm so sick of you!"
flat riley: "i'm not attracted to you anymore!"
flat carl: "i'm doing drugs!"
flat riley: "i don't care! fuck you!"
flat carl: "where the hell are my pants, did you erase my pants?"
flat riley: "they're in the icebox, frozen just the way you like them you goddamn son of a bitch"

people sort of talk funny in the second dimension. their thoughts are scattered and honesty is never an issue because lies don't exist. their world is too small to complicate things with lies.

but when they first tried getting back together they slept together and they slept together until flat carl was physically unable to do anything anymore.

when the real carl, the three dimensional one, first started having sex, he didn't really understand that sex was a complete physical and emotional connection with another person, no shirts no socks no nothing. his first real sexual experience, the first one that ever made his heart go crazy, was when he first had sex with riley, one time on his 21st birthday. it was the first night in about eight months that they had seen each other, and he was very busy with his film studies, and she was very busy with her political studies, and alcohol was everywhere and i guess they just sort of wanted to see how things would go

and later, about two months later things ended up the same.

this is what im trying to say:
flat carl and flat riley couldn't exist in two dimensions and carl and riley, as much as carl wanted it to happen, could not even fucking understand three.