@TNap0301,
Moving out is
always an option, particularly if you are in danger. Just like she's making flimsy excuses for him, you have been there for 6 years and from my perspective you may be making flimsy excuses for staying.
So, save money, and do it for the express purpose of leaving. As in, save pennies. Take another job, get a side hustle, sell your possessions, get government assistance, get a job like caregiver where you live where you work, etc. Do whatever it takes to get out ASAP. Your physical health if not your life could depend on it.
You can't fix them. He's damaged about ten ways till Sunday, and she's enabling him. This is their dynamic, and it's not going to end well.
In the meantime, be happy that he ignores you. Thank heaven for small favors, that you're not on his radar.
Do your best to be gone before he finally snaps. If he grabs a gun and starts shooting, I doubt he'll ignore you then.
IANAD