Learn what "why are you suddenly so sentimental" means, when people say it, and how to use it naturally in English.

It means the speaker notices an unexpected emotional or sentimental mood and wants an explanation.
From Good For Him, Episode 50
The speaker questions why the other person is suddenly acting unusually sentimental.
Use this when someone seems unusually emotional or nostalgic. It can sound teasing or skeptical depending on tone.
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