sweet on

To have strong feelings of affection or attraction towards someone. It implies a sense of sweetness or tenderness in the emotions.
داشتن احساسات شدید محبت یا جاذبه نسبت به کسی. دلالت بر حس ملاطفت یا لطافت در احساسات دارد.
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“I’ve been sweet on him since we first met. ”
A person might confess, “I can’t help but feel sweet on her. ”
Someone might say, “I think I’m sweet on my best friend. ”