Bmm1980:
I'm bipolar myself, we have 3 kids and my wife & I are now temporarily separated but are working things out. I was verbally and emotionally abusive to my wife for years and counselors told us a temporary separation was our only hope of saving our marriage. I take meds, do counseling, and live in an apartment for now.
I'm so sorry for what you're going through. I have no doubt your wife's behavior is from the bipolar. It is definitely a disease like diabetes or heart disease. There is no cure, but is manageable with treatment.
If I were you, I would definitely get some outside counseling (pastor, confidential friend, or professional). Don't go through this alone. This online forum is one of the best support systems you've found b/c everyone here can relate to each other's struggles. So keep us posted.
I think probably your biggest concern is your kids like you say. Remember, your wife is the one with the serious problems, not you. Don't blame yourself. You should not be the one to move out (you're the stable one)!
This is one option maybe: begin keeping a journal of negative/destructive things she says/does (be specific with dates, etc). If months more go by with no changes, you'd have evidence to show a judge if you seek a legal separation or divorce so you can gain custody of your kids.
I pray you don't have to do that, but your kids' welfare is the biggest concern at this point. I'm going to pray for you tonight--please keep posting. . . . .