Girls, should I leave her alone or give another chance?

So I have been talking to my ex, she and I both say we miss and want to return to how we were but I'm still not sure because sometimes she seems like she wants to try it again and sometimes it seems she doesn't care. I asked her why is she like that and she said " I feel a connection, but I don't" what does this mean? And should I just leave her alone all together?
Girls, should I leave her alone or give another chance?
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