Whats the best way to tell a female freind I need space for awhile?

Went on a few dates this girl then she decided it's best we just be freinds. Since then we have become really good freinds. She's since started dating someone else but we still talk frequently. I thought I was fine with just being freinds but since she's started dating some one I realized that I'm not. How do I tell her I need space away from her to get over these feelings for her?

Whats the best way to tell a female freind I need space for awhile?
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