thats a good start to protect yourself...it is very hard to maintain composure...I assure you if done properly you will only help your sitch...
If you feed into the gaslighting- there will only be more gaslighting...then the home is a stressful environment and you become the crazy person and he becomes the victim...
I learned the hard way...but that's OK b/c I learned...
Its hard as hell but you can do it and be a CLASS ACT