For those of you who haven't had the pleasure of knowing people neck deep in addiction I'm going to break down what is happening here for you all.
Ralph and Scarlett are so far into a coke bender that they are actively doing crazier and crazier shit to justify being unable to leave so they can continue their access and use of the cocaine. After a certain point when a person does enough coke in a short period of time (100x too much), you become so adled and delusional, every thought and action becomes bent around the need keep using.
Ralph likely got to the airport, started coming down (the more coke you do the harder emotional and mental crash. Lots of coke = suicidal come down) freaked out, and got sent waddling back to Scarlett and her 12g of blow.
If hes indeed are this stage, things will only go one way. The fights, the freakouts and possible violence will increase until the money and coke run out or one / both are in jail.
We are about to see some special trap house living here kids. Its going to be a hell of a finale.