I haven't asked a question in quite awhile. I'm just wondering how to deal with my ex?

He is acting jealous now that I have a great new man in my life. My ex had told me not to divorce but then after I moved out to think about things he not only filed the divorce papers but a bitter child custody fight which I won. He was telling everyone I was mental (must be leaving him). Anyway, he is arrogant and just makes himself at home when visiting my house, takes naps on the couch etc. I don't want to cause problems and try to get along for our kids but last time he was here he slapped me on the butt then just replied with whatever when I told him it was my weekend next. Most people have said I shouldn't even allow him in the house. I don't think he really understands the word DIVORCE and was hoping I would come crawling back. He always said I could never find any one else. He tries to find fault with my boyfriend too. I have been divorced over 2 yrs and separated a year before that. The divorce was filed by him less than a month after I moved out but because of the child custody it took about a year to be finalized. Will he ever let go?