1. Realise that you can not make her better.
2. For as long as you let her, the name calling, smear campaigns, and nasty attitude will never stop.
3. No matter how much she acts like life without you is better, she's still the same old girl she was when the relationship ended.
4. Remember that you deserve better.
5. Her life still sucks and you are better off focusing on yourself
6. You can't be friends with her, unless you are a glutton for punishment.
7. She is a psychologically understand developed person or you, be accountable.
8. She doesn't love you, yet you are still worthy of love or fornication. Your choice!
9. Take good care of yourself; create new routines, train more, find hobbies to distract yourself, read books, and stay away from her (forever) or areas that reminds you of her for some time.
10. Delete her number and all the message that would leave you second guessing your decision to stay walk away.
11. Don't jump on another horse without a saddle aka stay single for sometime, the get back when you are ready. Although I'm an advocate for plate spinning, I still say; at some point the party has to die and you have to get real with yourself.
12. If she comes crawling back, do not open the door or answer her calls.
13. Always remember that she is really that crazy, so focus on relationships that are already working i.e family and/or friends.
14. Always remember that people who love you want to see you happy and healthy.
15. If you lived with her, spring clean your house and get rid of anything that may remind you of her.
16. Analyse how you ended up here and learn from your mistakes. Get and pen and paper if you have to.
Tip Chantfire for their post.