I think there's a lot of wisdom in the idea that he's unlikely to have changed, especially at this point. I've been willing to acknowledge and work hard on my issues, but he's seen nothing wrong with anything he's done, and views himself as being the only one who's put in any effort. I'll readily admit that I neglected my marriage, too, and that there's a lot that I could and should have done differently. I've seen none of the same self-examination from him, though.
This suggests to me that he's not looking at himself and will still be the same person who avoids responsibility and puts the blame for issues on someone else. And, even if he's making changes like losing weight and getting a job now, he's doing those things for himself and because he has to, not because he's invested in working together with someone else to build a life together.