My H has been home almost two years and J3B is right...piecing is harder than standing for your M.
There are days when it is difficult because I get upset and my instinct is to bring up everything but the kitchen sink! I don't because I chose to let H come back home and our M is better for it.
My H wanted to come home at the same time things finally settled down, I had a routine with the kids and was learning to be a single mom (and doing well, if I can pat myself on the back)
I think the minute the WAS sees the LBS is ok without them, they doubt their decision and realize what they are missing.