Stop contacting him! You're never gonna convince him of anything nor should you want to.
Go live your life. Stop being nice to assholes. Stop justifying yourself to assholes. You don't need their approval. Be independent of men.
Stop being so weak that you allow others to abuse you. Have more respect for yourself. You don't respect yourself enough. A woman who truly respected herself would have left this guy 5 years ago as soon as he started abusing her. You should value yourself too much to allow such things to persist. You need to really grasp this, otherwise you will continue this pattern with other men. And in fact your weakness and lack of boundaries will invite abuse. A man will never respect you more than you respect yourself.
Congrats on finally leaving him. Do not make the mistake of going back.