Girls and sweet guys?

I tend to do things for this girl I like and people tell me I'm really sweet. I'm just wondering if girls like sweet guys or not, if they don't what do they like. Last night at work I told her I liked her laugh then she stopped laughing and kinda smiled, then I said oh so your not gonna laugh now and she said no then I said that's OK cause I think you're even cuter when your quite and then she laughed again. I tend to do what I can to make her comfortable around me, is this a good thing?
Girls and sweet guys?
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