Why is it that when I ignore my crush she pays more attention to me?

I like a girl - when I ask her out she doesn't reply back. However, when I ignore her she seeks my attention.

I don't understand. Sometimes it seems obvious there is physical attraction in spite of herself, but other times she makes a point of ignoring me. eg. She'd walk up to talk to me after I exercise and get flustered if we stand too close. But other times she'd look like she's talking to a friend the whole night paying no attention to me, but occasionally I'd catch her listening to my conversation whilst pretending not to be, or she'd cut into my conversation.

What is going on with this girl?
Why is it that when I ignore my crush she pays more attention to me?
Post Opinion