See some improvement with you but still a long way to go.
1) If this is the same daughter who wants to BF to spend night over then stop treating her like a child. You are not daddy and W is not mummy. You are parents. She is not fragile. She is cleverer and tougher than you.
2) Can you see how f@cked up your sentence is? "the Reason for her unhappiness is that mummy and daddy are still living in the same house yet they are seporated and she wants to live in separate house...do I then move out"? What about other children? Dont they get a vote to keep you at home or does eveyone want you to leave? Secondly, why would she want to live in separate houses? Maybe you mean she wants to live with W? Then let her but you would be committing suicide by leaving. It is your house. If she is old enough to want you to leave she is old enough to decide to stay or go because you are not.
3) Why why why talk to W. What do you expect to get out of your W? How does doing that change anything?
as for your last sentence let it slide. it is more of the same G 1.0 asking the same questions or making the same comments.
Finally, many of the questions you ask you would not need to if you really worked on your self esteem and matured. Before asking questions think on the answers. I bet you know them already. Dont ask people for answers you want to hear.
Your question about moving out .. if everyone said yes you would come back some posts later giving reasons why you shouldnt or comment about some incident and make another question but you will not leave.
All of these issues G are really what have made you lose all this time. You have not changed deep down.
As a petrolhead to another petrolhead you have done a DIY paint job but never a real overhaul. Until you sandblast all the way down to the core and rebuild up you will never really move forward or on successfully.