I need some advice

My life is so jumbled right now it's hard to explain. Ok, I got married in 2009. At first things were great then my husband started abusing drugs and treating me badly. He was not supposed to be able to have children due to a medical condition  but when I was ready to leave, I found out I was pregnant. I stayed. Things got worse. I moved in with family, he went to jail after I gave birth. He wrote me in jail and did the whole promise to change routine. When he got out, I gave him another chance. At first things were good. He kept clean but couldn't keep a job because he couldn't get along with people. He resented that he couldn't blow money because he had a family. The emotional abuse got really bad and when I started standing up for myself instead of keeping the peace, he almost left me and wouldn't talk to me for two months. I found out there was another woman our whole marriage. I moved to another town once earning my degree and he moved with me because he was a parasite. Apparently, he expected me just to forgive and forget and want to be with him because we have a son. He never communicated this with me until I almost began a relationship with an ex who was good to me. My husband flew off the handle. It was ok for him but not for me apparently. I had known for years that my marriage was toxic but escaping it seemed impossible. I let him have my apartment, I got a house and I walked away. He stalked me, smashed my car windows, but eventually things calmed down. We are not together but we are not legally divorced. He gets scary when I try to push the divorce through. He doesn't want to pay child support. I just kept going with my life and taking care of my child alone. Eventually I fell in love with someone. They know my situation and protected me from it. My husband has only tried his crap once since I've been dating this person. (Plus I don't know why my husband would keep trying to own me when he has women at his house often) things have been peaceful and we found out that we are pregnant. At first I was happy. I am still happy about the baby but the realization that in my state, they will put my husband as the father has me terrified. I live in Kentucky. I heard that there might be paperwork I can get my husband to sign saying he knows he is not the father but I don't know exactly how. I'm terrified. The easiest thing I know would be getting a lawyer but I literally walked away and gave my husband my home, my money, took the debt with me and had to start from nothing. I'm not on government assistance, but my pay checks leave little extra.