Am very confused with a girl (who is now my ex) that have been with for 4 years

in the first year of us being together everything was great like any relationship and for the last 3 years it has been for lack of better words worse since I been with jer we have been through a lot
I had lost my job and got my car repoed but she helped me get it back and she lost a custody case against her ex and is paying child support.
From what I come to find out she had a bad relationship with her ex and he was always negative with her and they were together for more than 10 years.
Now where we are at is that this is the third time she has broken up with me and the reasons for every one of them is because she has been treating me bad and always being negative towards and she doesn't want to continue doing that to me and she needs her space to fix her self.

Now I understand that she has been through a lot and I know I haven't really been helping with all of my issues I put her through too. I really thought it was a phase and I understood why she was like that with me but then it starting getting worse and she was just treating like shit.
She was very distant and never would show me any affection or talk to me or text me like she used to. And every time she would call or I would call her she would just say "Hey" I started telling her how I felt and she would get more upset with and would tell me that all I was doing was making her feel bad and pointing fingers at her and etc. So I just kept dealing with it until we got to another argument because she thought I was interested in another girl and said we needed a break and that was that. I didn't speak to her for 3 months and all of a sudden she started talking to me and after a couple of months we were back together.
And of course everything was good for a couple of months and then went back to the same thing and I told her again and we broke up again but we would still see each other from time to time. Then a couple of months passed and we got back together.

Now we went to the same problem and she told me that she is going through a dark time in her life and she need space from me and that she doesn't want to continue to keep treating me like shit but while she is trying to figure herself out she wants me to be around.

Now I don't know what to do there are days that I hear from her and there are days that I don't am usually always at work and home I don't do anything else but wait for her to invite me over to watch a movie or show. Anytime she needs help at her job am always there for her. But I feel like she is more distant and that her feelings for me is fading or at least I think so.

I don't know what to do I don't know what to say to her. If she calls me or text me I answer all the time but never do I ever try to contact her until she contacts me.

Now I know that she thinks that am probably dating someone else or that am out and about having fun but am not. Am not sure what to do or say and am not sure how to approach this any more because anytime I ha e tried to fix things with us if has gotten worse and I don't want what we have to get messed up because am being to pushy.

I don't know if I should stay and be patient because I do really love her and I can't stand being without her but it seems like she doesn't want to be with me.

All I want is to be happy with her and get our life going again.