Learn what "i couldn't understand" means, when people say it, and how to use it naturally in English.

This means the speaker is shocked and upset that a close friend acted in a cold or merciless way.
From Never Mess With A Badass Girl, Episode 47
The speaker reflects on a friend’s cruel behavior and cannot understand it.
Use it when describing betrayal or very harsh behavior. It is more reflective than conversational and not a simple everyday phrase.
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