You're not an idiot for feeling the way you do. You're human. Experience it, then go on.
IMO, I'd tell her that if she was the one who was unhappy, then she should be the one to move out. Stand your ground. I did to my W when she told me to move out.
When I told her I wasn't going to budge she looked at me as if I had 3 eyes. I told her that since she was the unhappy one, then she should leave as I was perfectly happy at home. She moved out but that's her decision.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.