Mama,
Coming from abusive and crappy parents, I have always been a proponent of staying together for the kids and being the best parent you can be. Fast forward 36 years, after so many times of forgiving his narcissistic behavior, I am now STUCK. Don't be me, now walking around with anger that I didn't divorce years ago and make a new life.
Start now and save some money. Get a job if you aren't working. Make an escape plan.
Trust me, you will be sorry if you don't have a plan. And having that plan will give you what you need to do to either make him change his behavior or peace of mind knowing that you can end it at any time. Big hug. Feel free to pm me if you need additional support!