If you are from CA, you must have friends and family you can crash with for brief periods, sequentially. Family especially, for holidays?
Living together this way would drive me nuts. Same bed? I wouldn't sleep with him. Go out together? Not me. Present as bf/gf? Nope.
I'd be packing bags and boxes and getting rid of stuff too, or shipping it out there, or even putting it in a storage place if you have a lot.
If all that prompts him to want to 'undo' the breakup, then you can decide what to do - but not quickly. After some deep communication and agreements, or it just gets easier to dump you each time.
Of course he may really want it to be over. You two really must not talk things out!
If he's just calling your bluff and you want to know, then ask him how he feels now, and does he want to talk - while you are stacking boxes to the ceiling.