If she has just come out of a relationship, she may be missing the things she and her boyfriend used to do, which might explain her behaviour. He is probaly unsure of what to do with herself at the moment.
So Im afriad Im gonna have to give you the worst advice in the world - give it time.
Let her find herself and get back on her feet again. Everyone handles a break up in different ways, becoming very flirty is one of them.

But it sounds like she may like you. If you like her too, then it might be worth the wait.

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