My best friend of over 10 years still has feelings for me. Should I slowly downplay (or end) our friendship?

Is it selfish to remain close friends with someone who’s had, and still has, feelings for you?

My friend told me she had feelings for me two years (I believe) into our friendship, and I didn’t reciprocate that romantic interest.

She asked me a few years later if I wanted to go on a date with her, and I recently asked her if she was interested in anyone. She said “You? Lol, jk.”

My best friend of over 10 years still has feelings for me. Should I slowly downplay (or end) our friendship?
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