It's interesting to read everyone's replies - and I'm sorry for those of you having a rough time.
I'd say the last few years have been some of the hardest of my life. I split completely from my wife and had to move out 3 years ago. It's taken until about now to get used to it I think. At first I had no idea what to do - I think in the back of my mind I sort of thought maybe I'd go back some time . But I don't think that's going to happen this time - I don't actually think I even want to now, even if my wife wanted me to.
We did this about 12 or 13 years ago too and that was just as hard - maybe worse, because my son was only about 12 at the time. I don't actually remember why I had to leave that time, but I remember it being hard. That time lasted about 18 months then I went back to live with them again.
It's weird having spent so long with someone - I've known my wife for 30 years this year. Half my life. So it's strange trying to work out what you're going to do next.