I'm going to accuse an ex of a crime she did not do, causing her to lose friends and trust
Why accuse her unjustly?
She is the one who ruined my life so I should ruin hers
You should not falsely accuse her of a crime. It is wrong and can ruin her life. Just talk to her if you feel you have unsolved things between her and yourself.
She has become an annoying dike. I have to take care of this.
What she may have done to you was wrong, but your actions are not any more right.