Sleeping

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Hello guys,
So I've been living in my friends family basement for a bit. I am 26 years old , these guys have been family to me for over 10 years. I have a gf and we are saving up to buy a house and so I can move out. All sounds good but its not of course. My roommate not sure what he has but he is very emotional. He flipped out over a piece of paper that landed on his side and almost kicked his dog. The second time we got into a small argument and his mom caused him to flip out. Then he banged his head against the glass and almost got a concussion .
He always threatens to kill me one day and etc, even though I think he is slightly serious. plus it doesnt help that someone died outside my door when my friend was a kid. So everyone thinks the house is haunted. I continuously wake up easily in his house. Sometimes from scary dreams or from sensitive noise, both times usually sweating(typically with the heater on though).
I always have two options, either a) go stay at a relatives house on the couch , or B) Sleep at home and maybe have a scary night.
I live in Cali so the rent is kinda high but with my company doing good I could afford it but waiting a year would be better so I can buy a place. Should I just move out ? Or wait until I get enough money to buy a house and get out then ?