Wird in Zeile 24 erklärt, weshalb Justin "at the end of his tether" ist? Wenn ja, stellt sich...heraus...

Im Sinne von: "wird deutlich"? Dann vielleicht: "becomes evident".

"come out" ist raus?

"to come out" heißt ganz wörtlich "herauskommen", also "einen Ort verlassen". Also nicht "sich herausstellen"!

Merriam Webster
Definition of COME OUT
intransitive verb
1a : to come into public view : make a public appearance (a new magazine has come out)
b : to become evident (his pride came out in his refusal to accept help)
2: to declare oneself especially in public utterance (came out in favor of the proposal)
3: to turn out in an outcome : end up (everything came out all right)
4: to make a debut
5a : to openly declare one's homosexuality b : to openly declare something about oneself previously kept hidden —often used with as (blew his cover and came out as a CIA agent — William Prochnau)

It also means "sich herausstellen" - depends on your particular context.

Raudona, Did you contradict yourself on purpose? :-)

Carly, keines deiner Beispiele würde ich mit "sich herausstellen" übersetzen:
1a: herauskommen
b: deutlich werden
2: sich aussprechen für
3: sich zum Guten wenden (oder so)
4: debütieren
5a: sich outen

Actually, I also wanted to keep it simple - "comes out" is definitely incorrect in the original sentence, don't you agree?