@Kaylasmum49
I agree that you do not need anyone 'condemning' you, but if you read back what you have written, can you not see why some PP's have been 'harsh' in their comments ? 
You say in your OP that you're ''I'm starting to think that I should just stay'', and in the same post, detailing frankly horrific examples of your P's latest abuse............
You are also trying to 'justify' thinking about staying by saying your children are 'unaffected' or 'unaware' of most of it, but totally ignoring the fact that there's no way you can be sure of that (kids, particularly ASD kids, are often hyper-intuned to 'atmospheres' and 'micro expressions', glances, fear, anxiety etc) and that both DC will be very aware of these things, but will not want to add to your stress etc by admitting it. It's also possible that, for now, they've taken the option that you have shown them, to pretend it's not happening, and 'hope' it will all 'go away'............................
It's very possible that it is only once your DC's are removed/safe from your home, that they will feel 'able to express' their true feelings/ issues etc. This is something you need to be prepared for.
I, along with other PP's, are truly struggling to find the words, and to express them adequately in a way you'll be able to recognize, how your post just shocks us. We cannot understand why anyone would stay in that house/relationship a second longer !
There truly is no 'rationalization/reason/excuse for choosing to remain with someone who threatens to set you on fire !!
I understand the 'fear of the unknown' aspect of leaving, but surely anything and anywhere would be better than staying under the same roof as someone who wants to kill you ?? (What would your poor DC have then, if he kills you ? Orphans, with the knowledge that their Mother could've left, but chose NOT to ??)
Please, please, put all your 'doubts' and 'what if's' to rest. You know you must leave for both yours and your DC's safety, anything less would be (quite honestly) an act of insanity.