Just wanted to post my support. Like many others, I was in a similar situation myself a few years back. Dh left for a week and it was by far the worst week of my life. Managed to hold it together during the day for the kids, at school, nursery etc, but once kids in bed I fell apart every single night.
Like someone said, your point of reference has gone. It's that awful feeling that nothing would ever be the same again. I felt so sad for my kids as the age they were at that time, they would never have remembered their mum and dad being together.
However, in my case I fought for him and he came back. Bizarrely, our marriage is stronger now.
The selfishness of walking out on wife and children never ceases to amaze me. To leave your wife dealing with the ups and downs of 4 children while you sit back, relishing your freedom! Unbelievable.
I used to believe in marriage, but now, honestly, I couldn't say that any marriage is for ever. No-one could believe that ours came close to ending, but since then another 3 of my friends' marriages have ended, 3 couples who I used to think would be together for ever.
In most cases it is men and I do believe in the mid-life crisis thing. Men are pretty stupid and do seem to confuse sex with love.
I know one couple, he left her for another woman, set up house with this woman, then realised his mistake (ie domestic life has mundane moments no matter who you are with) and asked to come back!!! Cheeky arse!!!