Girls, what does it mean if she just says "oh"?

Anonymous
so me and this girl were just talking, and I told her about how I treat her different from every other girl. she asked why, and I just said that me thinking about it would be a waste of time, but I'd just noticed I'd been doing it subconsciously. then she just answers "oh". why did she say that? did I do something wrong? what does it usually mean when a girl says that?
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Girls, what does it mean if she just says "oh"?
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