Learn what "so what's with the sudden change of heart" means, when people say it, and how to use it naturally in English.

It means asking why someone suddenly changed their decision, attitude, or feelings.
From I Think My Wife Wants To Kill Me S2, Episode 54
He is questioning why the other person suddenly changed their opinion or plan.
Use it when you want to challenge a sudden reversal or unexpected shift. It can sound skeptical if said with a sharp tone.
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