Well, if you're low on funds now and nobody is willing to contribute, you either cut now or go broke. Working in Thailand is not an option.
Easier said then done, but try just paying for yourself, or half the rent and bills. Your reason is you can't afford any more. If that's not acceptable, then leave without arguments or fighting. Or move out, get a place you can afford and the partner can come visit you.
*I'm not sure how you would relocate back to the USA at 70 without substantial savings or supportive family, that's another thread.