
Be sweet on somebody
Casual Romance
Used to describe light-hearted romantic feelings more than deep love.

I think he's been sweet on her, always smiling when she's around.
Not for Heartbreak
It's not used for situations of serious heartbreak or long-term relationships.

She's been sweet on him, but not heartbroken since he left.
Youthful Tone
Often suggests a younger, more innocent type of affection.

Ever since they were kids, he's always been sweet on her.
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