Hello PC

I wish wellness for you all, be safe.
I'm looking for suggestions on how to respectfully, sensitively and thoughtfully end an unhealthy friendship. Unfortunately, after giving this much thought, there is absolutely no possibility of a hopeful alternative, the friendship must come to an end.
I value the friendly support she has provided me at times. She knew she could always talk to me too about her challenges, all of which I supported her through, trying the best I could to make sure she was as happy as she could be.
Unfortunately. I've sadly come to realise she is often judgmental, passive aggressive, confrontational and someone who seems to not want others to be happy or at least not before she is happy first. I have many examples of this.
It is really hard for me to explain the situation delicately without sounding extremely upset, bitter and bias. I have thought about this for a long time and am finally ready to act. I do not want to upset her in any way and wish to end this maturely and without any stress or conflict.
I am sorry for such a negative post.