What does it mean when a guy says "you're the sweetest girl"?

Anonymous
So there's this guy I've been seeing recently
We go out for dinners, movies, dessert, etc
We message each other from morning till night everyday
Then today we planned another date for weekend
And then he messaged me saying
"Honestly i think you're the sweetest girl"
What does that mean from a guy?
What does it mean when a guy says "you're the sweetest girl"?
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