Why wouldn't my ex contact me?

I have caught up with my ex a couple of times as of late. Once just the two of us and another with a friend. I felt there was something between us during both interaction and there was some flitlrting. However she doesn't contact myself or reply to my contacts for a long period of time. As far as I'm aware she's not seeing anyone new in terms of a romantic relationship.
Why wouldn't my ex contact me?
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