I don't think you are slipping into MLC. It is all the adjustments you've had to make that has caught up with you and causing you to think about a different life than the one you originally thought you would have (with wife). So, as you said, you are thinking about things you once enjoyed that doesn't include your wife....or not necessarily any others.....just you. It's been a few years since you've done that so you probably do feel a bit odd trying to fit your nitch, so to speak.
You're going to be fine. Try not to worry about what you think W may be saying to the boys (I know that's hard) and try try to focus on your life in NYC through the week and your kids on the weekend. When you can to talk to them on week nights....that is an extra bonus.
Have to leave for work. Hope you have a good day.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!