Learn what "i don't know what i'd do without you" means, when people say it, and how to use it naturally in English.

This means the speaker feels deeply dependent on or grateful for the other person.
From Mysterious Murderer, Episode 48
The speaker is expressing how important someone is to them.
Use this to show appreciation or emotional dependence in close relationships. It sounds warm and heartfelt, so it may feel too intense for formal settings.
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