What does “it's a long story” mean?

used to say that the reasons for sth are complicated and you would prefer not to give all the details

How is “it's a long story” used?

In Paulie (1998), one line is: “- Trouble? Why you say that? - It's a long story.”

The clip at the top of this page is from Paulie (1998).

- Trouble? Why you say that? - It's a long story.

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