What do I do if my bestfriend is acting strange because she likes me?

(my friend doesn't have an account but he needs some advice so i am asking the question from his perspective)

My best friend likes me... she has confessed to me in the past... but due to unfortunate circumstances i was not ready for anything more than friends and i am still not ready. It's not just her but it is anyone in general. And i know for a fact she wants to be around me and I really like when she is around too but I always sense a tinge of sadness in her and I'm positive that it's because she is not happy by being "just friends". If this keeps up I'm very sure things would end badly for both of us and I'm not sure what to do.

I don't want to lose this friendship and I bet she doesn't too but she is not happy rn and i absolutely cannot have her sad.

What do I do if my bestfriend is acting strange because she likes me?
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