Girls always smile and sometimes sort of giggle when I talk to them or when they talk to me? does this mean they like me or find me attractive?

i will say they don't always giggle but almost every girl i talk to has a smile and appears to be in a really good mood whenever i talk to them.

Girls always smile and sometimes sort of giggle when I talk to them or when they talk to me? does this mean they like me or find me attractive?
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