Pack your things and go back home - Tell her if she needs "space", she can move out but you stay and the children stay.
Serenity's spot on. Go back to your home. Serenity's right about her space. If she pulls any cr@p about "now the kids need space, too;" or some other nonsense, tell her, "they have their space: it's called home and home is where they are going to stay regardless of your decision!"
Gardener
"My soul, be satisfied with flowers, With fruit, with weeds even; but gather them In the one garden you may call your own." Cyrano deBergerac