Best way to ghost but not really?

I have dated this one girl at work for 6 months, I feel in love with her, but the best I got out of it was her liking me back and being attracted. Her feelings never developed further and called it quits to only being friends. There's times where I flirt with her and she flirts back to the point of even kissing one time but she states she only sees us as friends at the moment. I promised her we can still be friends but we also work together and feelings come up. How do I fade out a bit if I decide to put some distance?
Best way to ghost but not really?
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