I was psychologically abusive to my ex-girlfriend.
Why were you psychologically abusive to your ex girlfriend?
She inflicted emotional abuse on me for a long time.
Since this is your ex girlfriend, it would be best to move on from the relationship. You should never abuse anyone but since this relationship is technically over, you need to get on with your life.
She was annoying and other people are now doting over her. She needs to be bullied and then healed by me.
You getting back into messing with your ex-gf's head is a bad idea. Treating your ex with dignity and respect is what is needed here, not your mind games. Leave her be.