Ex-wife cheated twice, we're separated until divorce is finalized

I'm the ex-husband. I've known my woman, my love since 2011. We've been trying to work on us since 2016. Our work schedules are different, but I still try to make time for her regardless. She's working 2 jobs and I am too. I'm not sure how she does it because she's kinda sickly with some blood disorder. She sleeps when I'm with her, has shortness of breath and gets lightheaded that can make her pass out sometimes. She's been so good to me, when I had money and when I didn't have any. This past Christmas I wasn't able to get her anything, but she said she didn't want anything, but me. She makes me happy and when she smiles, it makes me even more happier. She even gave me a meal and cake for my birthday. We don't argue or fight, we never have. I don't like drama and neither does she. We don't live together, but she's asked me if we could move in together. I told her that's something to think about. I wish I could have given her an answer then, but I didn't. I have to sit and talk with her because I don't want to lose her. It's about my past. She knows I have a son, but I think I have a daughter too (I'm getting both children tested to make sure they are mine because my ex-wife stepped out on me, while I was working long hours to provide). I'm no longer with my ex-wife, she keeps saying she wants to make us work, but I've been hurt enough and told one too many lies, to believe anything. She always went out after work and would be full of alcohol. She kept her previous lifestyle, as if I never existed once we were married. I feel like I made a mistake when I married her, I wasn't in love with her. She helped me a little, but not supportive in what I wanted. She made more money than I did after I lost my job, but quickly gained the 2 jobs I have now to stay a float. After we separated, that's when I found my woman again. Long story short, we were together before I got married and someone she knew, knew my son's mother (ex-wife) and told her everything. She told me to go be with her because I had to be a father to my son(I'm not even sure he's mine, I worked more than 14 or more hours a day, he has my name, but I stepped up anyways) that was in 2012. I got engaged in may after the baby was born in may and was married at the end of October in 2013. I wanted to wait a little longer, but she was pregnant again before we got married, I felt stupid and skeptical then. Right as of 2016, my ex-wife and I aren't together, I'm ready to divorce her and find out if these children are mine legitimately. I'm the only person they know as Dad, they are 1.5 and 6. I want to move on with my woman, my girlfriend, my love. I haven't been able to because my ex-wife has been in the way using the children as a ploy. I'm not sure what to do at this point until the divorce is set in stone. I haven't been able see my love. She understands me, loves me, she doesn't be little me or call me out of my name like my ex-wife did. My love supports me, like I support her. I get to be myself completely without fault or stepping on glass. If I could I would marry her right now, but I'm taking the steps I need to in order to clean up and get me in order first before taking on another marriage. I have to make sure I'm straight and my divorce is finalized first. I don't live with my ex-wife, I'm back home with my parents, working to make more money to be financially stable. I don't live with my love. We're still young though so my love and I are working to get financially stable before taking the next big step. I have so much I want to do for her because she's been so good to me!