How can I give a girl her space without her getting the idea that I have moved on?

I am madly in love with my ex. I believe she is the one. She wants some space or doesn't want to be involved with me right now. How can I give her that space without making her think that I'm over her? I want to let her have her space so she has time to miss me but I don't want her to think that I am over her.
How can I give a girl her space without her getting the idea that I have moved on?
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