How to heal from your past.

How do you heal from your past when, every time you have to deal with your ex, he does nothing but remind, and then adds much untruth to it? I have tried so hard to put my past behind me. I am happily remarried and have been for nearly 12 years. My ex is soon to be married, and he and his soon to be wife have decided to take me to court over money he owes me for the home he and I lived in when we were married. My ex-knows he owes this money, yet he is coming up with all sorts of reasons why he does not. He has created many false statements concerning our past, how we lived, and the decisions he and I made together concerning, myself being a stay-at-home mom, and the bills we assumed. In the court papers, only about two sentences concerned the actual case, the other 2 pages were pure lies! I don’t understand how you can do this to someone who literally has not bothered with you in any way. I have never interfered with his life, or his ability to be happy in it. My ex-did not like me when we were married. He was massively emotionally and mentally abusive. When I think back to the things that I allowed him to do and say, I am ashamed of myself. I am ashamed that I stayed. I am ashamed that I allowed myself to be treated that way. I must have in some way believed that I deserved it. I just don’t get it!