Okay, now that you see what the issue probably is for her checking out of the marriage, you're going to have to start to look at what the causes were. Think back to the time that your marriage was starting to be shaky and try to see what things your wife would tell you she was unhappy about. These are the things you're going to need to change. Sometimes it's more apparent what our issues were in our marriage, And then sometimes the issues aren't that apparent.
Much like you, my wife said same things, help around the house, kids, Etc. It seems like there were other things for my wife that she didn't tell me when she left that were the real issues. For me it was she felt like she wasn't my equal, my expectations were too high, I didn't give Her enough individuality. The tricky part is some of these are validate some are not, but in a WAS they all are valid. It makes you really need to think abou t how to change these traits.
M:36 W:37 T: 15 M:11 S6 D5 BD: 8/10/14 IDLY: 8/12/14 S: 8/13/14 (she left, I stayed w/ kids) D Mentioned: 10/15/14 Confronted about OM: 10/15/14 EA: ~4/13 PA: ~10/13 She filed: 8/15 (not final)