Learn what "robert must have" means, when people say it, and how to use it naturally in English.

It means the speaker believes someone probably knew the truth, based on the result that followed.
From Billionaire Daughter’S Love Triangle, Episode 50
The speaker guesses that one person already knew something and that another person wants revenge.
Use this when making a deduction about what someone likely knew or understood. The full line is too plot-specific for a focused phrase page.
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