What does it mean when a girl opens up to you and shares personal info about her, does it mean she's interested?

Zombifiedpikachu
So, this girl would seem to open up to me about her childhood etc. Send me photos, telling me memories and the like. She's quite a shy lass. We've been friends for a while now. Talking daily on Facebook. She'll share with me her awkwardness or her weirdness. We're both kinda similar. I feel she feels comfortable talking to me. When she opens up I'll get bombarded with short little messages. like any where between 15-20 messages I'm comfortable with our friendship at the moment but hoping it blossoms into something more. We have said that we like to get know to each other before dating people
What does it mean when a girl opens up to you and shares personal info about her, does it mean she's interested?
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