How is “fall apart” used?

In American Psycho II: All American Girl (2002), one line is: “Don't fall apart on me now, Rach.”

Which movie is “fall apart” from?

The clip at the top of this page is from American Psycho II: All American Girl (2002).

to have so many problems that it is no longer possible to exist or function; to be in very bad condition so that parts are breaking off

Oxford61% of films
to have so many problems that it is no longer possible to exist or function
I can't let everything we worked for fall apart.
Oxford28% of films
to be in very bad condition so that parts are breaking off

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

Don't fall apart on me now, Rach.

Said in 8 films · #1