"For once there is nothing on up my sleve" I think it means that normally he used to trick this girl but this time he doesn't plan to trick her, that he means what he is doing.

"The city outside looks like it's still on fire" there is still tension between their arguments

"Talking in circles" arguing the same thing over and over again, and he is glad that as they are talking is circles the distance is not changing, eventhou its not getting shorter its not getting bigger

"I pray to god that we can move on" he fucked up and really wnats to move on

"You'll make a beautiful mother" he sees her as the mother if their kids