A Question About An Ex Fiancee/Friend

I was wondering if anybody has been in the same position I have. I was engaged 3 years and moved into my ex fiancees parents house they just built after her father passed away. I did so because her mother and my ex needed help because the house was basically a camp that was just a shell and most of the interior was unfinished because her dad who did everything there passed away. I fixed everything up, put in a new septic system (they were using a 55 gallon drum we found out after digging it up), replaced their kitchen sink, put insulation under the OSB flooring (the house was on stilts), crawled under the house to fix their plumbing that would regularly freeze in the winter, fixed their electrical, and even gave them my washer so we could wash our clothes (an expensive Samsung smart washer). I did all this while working every day after coming home. I cooked and cleaned and fed all their farm animals as well as their 7 dogs in this tiny little house. Nothing was ever enough. They had me mowing huge pastures and everything else. I was not allowed to sleep for more than 6 hours at a time even though I worked overnights. Her mother and my ex were both extremely verbally and mentally abusive towards me. I have never felt so worthless in my life. One night we all got into a heated argument. Her mother said "You guys I can't live like this!" To which I replied "Neither can I!" It was like living in a third world country. No walls, no privacy, just insulation. It became clear to me I was just being taken advantage of so I gathered all my stuff together after living there a year and left. I had a feeling I was being cheated on too by my ex which come to find out i was right. She was seeing her co worker and my ex was their boss. It was like a knife to the heart. I raised her daughter for the last 3 years as my own child because her father was a deadbeat. I tried so hard to keep my little family together. After a month of me moving back home I ended up getting dumped for that person she worked with. Around Christmas I got messages saying that she was sorry for everything and that she wanted me back and she made a horrible mistake. I stupidly took her back late January just for us to spend Valentine's day together and have her dump me again after just begging me to marry her a few days before. She left me for the same person yet again after she promised she wouldn't hurt me again. Has anybody else been through anything similar? I've had her blocked for a long period of time now but she wants to stay friends although she continues to lie to me. She told me she wanted nothing to do with Alex (the person she left me for) even as a friend but she said they kissed her when she went to drop off their stuff to them and come to find out they have been seeing eachother still. Should I just ghost her? It kills me inside everything I have to hear about. I told her I may need friends and love but I don't need you and put her on block. Was I too out of line? Any assistance or advice in this matter would be greatly appreciated.