I'm sorry to hear that fez, my heart goes out to you
Just know that you didn't cause this to happen, it's just that stress and anxiety tend to cloud people's judgement. I'd say do whatever you can to help your parents, no matter how small or big it is.
What I mean is help around the house, clean, cook, get a job or help pay for house expenses, let them know you love them by saying it or hugging them, basically do whatever you can to show them that you care about them and that you will do anything to help them stay together.
My parents were thinking about it when I was in high school....I was heart broken, I didn't want them to leave each other and especially when my brother was so young and needed his parents for love and moral support. So what I did was step up to the plate and encourage them to stay together, not just for my brother but because I knew they still loved each other and just weren't thinking....I cooked all the meals, I took care of the yard work, house repairs, bills, etc....just so that they could spend time with each other, to rekindle the love they had lost and X amount of years later they're happy and healthy growing old together
I know you don't want to choice between who to live with, but don't just leave both of them in the dust, that would probably hurt them more than you know. If you absolutely have to move, then make sure you stay in constant contact with them, it'll mean the world to them
Again, do what you can to help your parents, especially your mom since she seems really stressed out. I'll keep you and your parents in my prayers. Let me know if you need any advice or motivation
Also know that we're your friends here, so you can vent to us about your problems