That his wife wants them to stay married is no surprise, but from what he's described I'm not sure she knows what she really wants in her life other than perhaps avoiding the fear of abandonment. She deserves better than a husband just going through the motions to keep up an illusion, but likely doesn't realize that.
What she theoretically "deserves" and what she will get aren't exactly the same thing. She has young children, is seriously overweight, and has trouble in social situations. I think it is likely she will have a difficult time finding a suitable new husband. The notion that Invaded? would be doing her a favor by divorcing her just seems wrong to me.
That doesn't mean he needs to stay with her indefinitely. I just feel like there's sometimes a level of dishonesty in these discussions where first people decide the best course of action, then twist things around to suit their desired narrative.
Unfortunately there is no black/white answer. Will he be doing an
obvious favor to her by leaving? Not in the slightest. All the points you raise are indeed valid. She'll probably go into a deep funk.
But here's the thing: Sometimes things have to hit rock bottom before they get better. Sometimes things have to be rebuilt from scratch. From reading the thread so far, I think Invaded? is in that situation. My take on the staying vs. leaving outcomes are these:
- He stays: Things remain miserable, the wife makes half-hearted attempts at change, but really can't due to her own issues she needs to address. Things aren't better for her or him. With him there keeping up the illusion, she has no real incentive to look within and begin serious change. Yes, there is an outside chance she suddenly starts owning and addressing her issues, but I'd put those odds extremely low.
- He leaves: Either (a) she continues her miserable ways or gets even worse because she's clueless that her misery stems from within or (b) she one day decides to look deep within because he's no longer there to project her misery onto and begins the long path toward recovery.
So she'll most likely to continue her misery if he stays, she could very well continue her misery if he leaves, or she could finally look in the mirror and start fixing herself if he leaves. So yes, I do think he
may be doing her a favor by leaving, but he's doing her
no favors by staying.