Is passive suicide ideation a sign of immaturity, or something serious?

I mean, you think, don't act.

Then something happens that makes you happy, and your past thoughts seem stupid.
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Say, whenever the person's deepest worries feel reaffirmed to him, and that leads to a chain of "My life will forever suck" thoughts.
Is passive suicide ideation a sign of immaturity, or something serious?
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