Learn what "i'm going to ruin your life" means, when people say it, and how to use it naturally in English.

It means the speaker is promising extreme retaliation that will seriously harm the other person.
From Revenge On My Cheating FianceÌ, Episode 1
The speaker is threatening revenge after being deeply wronged.
Use this only in fiction or very heated conflict. It is extremely aggressive and not appropriate for normal conversation.
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