I'm sorry you have to go threw this dark time.
I have been In many similar situations ( abusive relationship after abusive relationship)
It's not easy to leave but I urge you to try and reach out to a women shelter and make a safety plan.
Keep reaching out on here if it helps you feel connected
And don't try to kill yourself yo escape.
More likely than not you will end up with some injuries or trauma and still be in the same situation.
I ran my vehicle head on into a semi and lived and then a year later jumper off a 120 foot bridge into a river and I'm still here ... it only added extra trauma that I had to work threw and kept me in the same type of situation relationship wise.
Your right about it escalating and you can never tell when it the switch will flip and it won't be glass it will be you getting hit ect...
If you can even if you don't stay go to a shelter and try leaving situations like this often take many may tries so the sooner you start trying the sooner your will succeed..
If your struggling with suicidal thoughts get help for that it will remove you from the situation for a while and you will start to build up your confidence again..
You deserve to be treated with love and respect .