Do nothing. Stay put. Stand your ground. If she wants to leave then that is totally on her, she needs to make that decision, find a place, set it up, deal with all the inconveniences, etc. etc.
Thank you for posting AnotherStander. I read all of your points and advice with interest. I feel a little less selfish reading how other people think i should not leave. I have been beating myself up over whether it is the right thing to do in regards to the children's welfare. In my heart i definitely don't think that i should leave.
I don't think that W will either. The reasons why i think that this is so, i will elaborate upon in a subsequent post.
Me: 49 W: 47 M: 19 T: 25 Son:19 Dau:13 Son:6 BD: Aug: 2012 Separated - same house: May, 2013 Ultimatum to move out: Dec 2013 W looking to move out: January 2014 Dau says go, I move out: June 2014