Separated for 1 month, need to tell emotionally abusive narcissist that I'm filing and getting my own place

What did YOU say to your spouse?

I want to do it tomorrow while the kids are with grandma. I'm just going to say "I'm unhappy being married. I have met with a lawyer and will be filing for divorce. I want this to be as amicable as possible especially for the kids sake" and then let them speak.