Once thing comes to my mind. My wife asked me for a trial separation. I said no. We are still still living together.
Someone pointed something out me, maybe it applies to you, too.
Your wife won't leave without the kids. She can't really leave with them, unless she files for divorce and the judge decides who goes where. The last "civil" option is getting you to leave voluntarily. You must conspire with her to end your marriage. Of course she's nice to you when you are making motions to leave. She might even suggest it will give you both MORE hope to reconcile. She wants you to unseat yourself and give you place to another man.
Don't walk out on your kids until the judge tells you to.