Ladies, how do I get better at respecting my female friends boundaries?

The friend in question is my ex, and sometimes I think back to when we dated, and I shutdown in a way, whenever she doesn’t act as close as she did when we were together, so she feels uncomfortable. She wants to be friends, and asked if I still had feelings. Am I in the wrong here?
Ladies, how do I get better at respecting my female friends boundaries?
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