I doubt you are the entire problem, women can nitpick a man to death because that's how they get power. Sounds to me like you are already considerate enough, just by the fact you wrote this incredible cry for help. Sometimes the only way to get a woman back is to let her go. Relax a little bit, sounds like the tension is thick enough to cut.
I think you should be man enough to tell her: "I'm doing the best I can and I hope to get better through time, that's the most any man can promise. If you think it is easy to find a man who cares as much as I do, don't let the door hit you on your fat butt on the way out."
We've really, come to think of it, only heard ONE SIDE OF THE STORY here.
The poster may be sincere and telling us all. Then again, possibly not. Maybe there is something left out for convenience sake that would have caused most wives to have left ages ago. I can't offer any true advice as I don't have the whole picture.
I must say, though, this thread sure is a combination of seriousness, jokes, spirituality and crass securalism...all rolled into one. FR is great!
Nice Touch!!!