What do your kids say about you sleeping on the couch? Don't you think the one who wanted out of the M should take the couch?
In-house separation is very, very tough. From what I have observed, it is like having your life slowly drained away.
The lack of respect and resentment toward her H seems to be the first steps to a woman closing down her heart. I have several threads about wayward wives, if you want to read them. If you see your W in what is said in those threads, I think it will give you a clearer direction on what you can do.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!