What does it mean in Facebook if?

What does it mean in Facebook if a person's post shows up first on your News Feed, even if its not the latest post? Also if that person is always shown first when you view your list of friends?

I am trying to get over this girl, but I can't see why she is on top of my Friends list and her posts show up first. I don't know how to tell her because I don't know what it means and also she has a bf so she is not in a position to accept me.
Updates:
+1 y
Has she added me to her close friends list?
What does it mean in Facebook if?
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