How to tell if a shy girl is obsessed with a guy?

Anonymous
I imagine that shy girls rarely take the initiative in the beginning stages and likely waits for the boy to take the initiative. For example, maybe she never texts first and why do shy girls try to minimise their talking time with their crush, are they just too nervous near them? Will she perhaps click on every Insta/Snap story with haste? What will a shy chick do if she's obsessed with the guy?
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Will she also perhaps try to make the guy jealous?
How to tell if a shy girl is obsessed with a guy?
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