Learn the tone, meaning, and better English alternatives around "he's been acting" with real scene examples.

It means the speaker thinks someone is behaving unusually and may be hiding something.
From I'M Obsessed With My Boss Part Ii, Episode 46
The speaker notices unusual behavior and starts to suspect something is wrong.
Use this when you want to point out odd behavior without making a direct accusation. It is common in conversation, but still feels somewhat speculative.
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