he said he was giving me to the end of the month to change or we'd have to go separate ways
Hey, then there you go. You got your key. He wants you to change how, exactly? To be fine with him calling you lazy, dirty and disgusting? That is NOT fine, not for any reason, don't change, keep sticking up for yourself past the end of the month and always. Geez!
And this:
"I will probably drink myself to death if you dont"
is pure manipulation.
Good for you, not taking it anymore!