Learn what "that's not best friend behaviour" means, when people say it, and how to use it naturally in English.

It means a close friend is not acting loyal or supportive.
From My Sister Stole My Man, Episode 3
The speaker criticizes a friend's behavior as unacceptable.
Use this when calling out a friend’s bad behavior. It can sound hurt and confrontational.
Scenes unlock real expressions as you watch
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