If your partner still "blames" the same reasons you think you have fixed then I think there are several scenarios to consider. Either you haven't really, you have but not enough for him, OR he really has his own reasons and is just using the old rhetoric. I said before it is encouraging that you have come back together after A separation, but maybe he neve really did come back, making it easier to get distracted by another woman. How was the R when you got back together?
I think he has his own reasons that may have something (but not everything) to do with these issues. I believe that he wants to live the "single guy" lifestyle and do whatever he wants without having to explain himself to anyone. And I think that single guy lifestyle includes hanging out/dating other people. Maybe he wasn't ready to get married because I feel like he just wants to be back in college again. Currently he's living in an apartment, hanging out with younger people, going out every night...no responsibilities.
Me:36 H: 29 T: 4 years M: 2 years No kids In-house sep 10/4/14 H moved out 1/2/15 Talk of D 4/9/15
"She's standing on a line between giving up and seeing how much more she can take" John Mayer