If a girl says "That's sweet" or "You're sweet" what does that mean exactly?

Anonymous
This doesn't really pertain to any particular girl or person, but I was just wondering: if a girl says that a guy is sweet or something that he does is sweet, what exactly does that mean? Does that mean that he is in the friend zone or something?
If a girl says "That's sweet" or "You're sweet" what does that mean exactly?
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