Learn what "how could i be so blind" means, when people say it, and how to use it naturally in English.

It means the speaker is criticizing themselves for not noticing the truth sooner.
From A Love Once Betrayed, Episode 7
A character reacts with self-blame after realizing they were fooled or failed to notice something obvious.
Use this when expressing regret or self-reproach after being deceived. It is common in emotional scenes, but not in casual conversation.
Scenes unlock real expressions as you watch
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