Hi, Willitend.
Welcome.
You are doing the right thing in separating from your addict.
Sometimes it’s let go or be dragged.
But....the thing with ultimatums is you have to be bone deep, absolutely, unequivocally willing to carry them out.
I would prepare for pushback all along the time leading up to the deadline and major drama after the two paydays deadline hits.
Addicts will do anything, anything, save cutting off a limb, to stay in the situation that allows them to carry on using.
I would stay firm and maybe think about plan B if he doesn’t follow through.
Good luck and hugs.