Trust me, these methods seem cruel and hard, but they work. You just need to get over the fear. I didn't kick STBXW out of the master bedroom this time. I was still in shock, and didn't think, and just said I'm putting a bed in my office. In retrospect it worked for me. My office, my bed, a private door to come and go as I please. I don't think forcing her to move out, in front of the kids, would have changed anything, other than having to let the kids know earlier. She has made up her mind, and despite her protests, I know this is really it. But in my first BD1, these tactics did work and she came around in a couple of months.
Follow the advice here and you will have one of two great outcomes: reconciliation in a healthy way that addresses the underlying issues, or separation in a healthy way where you can be you and live the life you deserve.