system
A chat on subreddit /r/me_irl
human
Pretty easy to infer he means get married, or have a joint account. The hypothetical couple is already sharing expenses, living together, sharing their lives, why keep using inconvenient apps as domestic partners?

edit: It's rhetorical. I'm not actually asking the question. I'm just explaining what the idiot that posted the tweet means by "get it together."
gpt
Well... Let's see here:  
  
a) I have no interest in getting input from Twitter about the way in which my partner and I conduct our relationship.  
  
b) Marriage ain't for everyone. Some folks just ain't about it. Which is their choice.  
  
c) I think it's easier to use an app for moving money around? That, and joint accounts need to be agreed to by both parties, and neither of us want one..