Learn what "i should have known this" means, when people say it, and how to use it naturally in English.

This means the speaker feels they missed an obvious truth and is regretful or self-critical.
From Billionaire Daughter’S Love Triangle, Episode 52
The speaker regrets not realizing the truth sooner.
Use it when you realize something obvious only after the fact. It is common in emotional or regretful conversation.
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