As to past work I agree--he owes you as agreed and you need to get off your duff and file a wage collection complaint with state dept of labor.
As to any future deal you two either accept or reject somethin gand get it clear on paper waht it is.
Until he either formally fires me or tells me what the new payor new deal is to be is I'd be of view that prior payscale is in effect but I would NOT share this view with him yet! You are into grey area of words--the new deal is X and Y is dead as to future , is not the same as saying Y will be over soon and we need to implement X soon.
He may think he said one and you though you heard other ..but don't refresh issue too soon to your disadvantage.
If he cannot afford to pay you, you need to make some other decisions as well!