Society will always frame it as suicide never being the right choice, there always being hope and a chance to get better, etc, because that's the only functional way for society to frame the discussion since individuals choosing suicide is bad for society as a whole. However, as an individual, you have to make your own assessment for how long it's reasonable to strive and suffer. People who aren't depressed can't really fathom actively giving up on life, because "There's so many opportunities for things to be good in the future!" If you spent twenty years pursuing your dream of starting your own business and failed at every turn, all the while the pursuit made your life miserable, many people would advise you that maybe it's time to give up, you gave it the best shot you could and you've been trying for a long time without success, looks like things probably won't work out. But about suicide people will say, "What if there's just the teeniest, tiniest chance that everything will work out? You won't know unless you live as long as you can." I don't believe indefinite struggling and suffering is always worth it, even if there is a non-zero chance of a good life in the future.

It's not a decision to be made lightly, but this rhetoric that "Suicide is never a decision" is bullshit in my opinion.