Um so I'd say this storyline is definitely trending dark now. The crazy awkward phrasing of "I'm going to wish I had a gun to shoot myself" makes it more weird and sinister. And I mean, we all knew Margo was a sociopath, but severing every meaningful relationship with no emotional breakdown or catharsis? I can't see a reasonable plotline that doesn't involve therapy.
Jeez, Lu Ann, what are trying to sell the apartment this morning? Do you really need to have this conversation right this second? Calling Margo a million times and then busting into her identically decorated office is probably not the right way to kickoff this conversation, and may result in a big deal and/or drama.
"Whelp, I'm off to the hospital for a triple graveyard shift. Definitely won't be home for dinner tonight when you have to tell Margo your plan to break the financial contract you have with her and disappear forever. I'm sure it will be fine though, Margo's been so calm and understanding lately."
On an unrelated note, did they change the lampshades to mauve?
Okay, so a little more exposition on Lu Ann's future plans: she will NOT be staying in New York, which overturns the theory that she will bum around/hook/live in squalor until Margo takes her back. Barking Monkey's theory that Margo will have a complete breakdown and Lu Ann will stay to help her through the tough times makes the most sense to me, which doesn't mean it will happen, but at least it would create a tidy (if impermanent) reason why Lu Ann can't leave the apartment, no one can leave the apartment, no one can ever ever leave.
Meanwhile, doesn't Tommie look DEVASTATED by this news? She's already thinking about setting up a home gym in Lu Ann's room, I guarantee it.