I never want my ex to be happy again. I want her to be miserable and alone for the rest of her life
Why do you want her to be so unhappy moving forward?
She made me feel overwhelmingly miserable during the past six months.
I'm sorry she put you through that. I think it's probably healthier for you to just forget about her though!  Get out there and find someone new, move on with your life!
I can't do that, I think about her all of the time.
I know that moving on from a relationship can be difficult, even if the relationship isn't a happy one. At times like this it is important to tell your friends and family what you are going through and to allow them to support you. One day soon, you'll look back and be very thankful that you moved on from that relationship.