I'm going to cut off the girl who used my mental health against me in breakup
What exactly did this girl do to you?
She manipulated me and tried to use my mental health as a weapon.
That sounds like an awful thing to have experienced. Having people manipulate you and take advantage of your vulnerabilities is wrong. It's a very valid reason for ending this relationship.
Nah, she doesn't deserve that respect.
I would end the friendship in a civil way, but at the end of the day, I fully support cutting dies. You have to take care of yourself and you don't deserve to be treated in such a negative way.