Confused. Don’t know what to do

So, I started dating this guy I had worked with in the past, however I moved to advance my career so this was a long distance relationship. We got along fantastic have so much in common. The relationship evolved quickly and we met up and spent time together. We decided that I would move back and we would live together. We talked about marriage and having children. The day that he came to move me there an ex from the past (one I heard about) started texting and sending nude photos then called hysterical because he was no longer available. Well apparently they started talking and this other woman was trying to show him how he chose wrong. I found out and didn’t take it well so I asked him to stop talking and block her. It didn’t happen and I kept pushing trying to ask do you want us to work. He said yes but never stopped with the other woman. He broke up with me and has slowly started seeing this other woman. But because I moved with no job I still live with him. I have asked for him to make me a bedroom but as of yes we still sleep together although we do not have sex. We make dinner together everything as a normal couple would but he also has a new girlfriend. This situation is very hard on me as I have to basically watch this new relationship. We have sense talked about things and although he said he hates himself for cues and he loves me he has not given up this ex. I don’t know what to do. I obviously can’t do no contact. I try and give him space and don’t text unless I have to. He works nights so we can separate to a point. Even on days off he spends them mostly at home. When he meets with the new girl it is before or after work for short times. I wish I didn’t know all this about their relationship. Before this girl we never fought were the best friends ever. But he did tell me when she broke up with him in the past he had loved her for years and even though she was not ready for a relationship then she is now. She is 15 years younger than us. And it’s seems to me to be very toxic from what he has said or I have gathered on my own. I don’t know what to do to get out of this situation. I’m working on getting a job and moving out. I pay for all my own expenses. Do we still have a chance? And what do I do to make things better? How can I get him back?