What should i do?

Yeah but if you leave the business will go under for sure...just saying.

This is why I have little interest of starting my own business right now, for every 10 new businesses, most go under within a few years

I feel safer working for an established company that has a solid work load

Is he advertising, passing fliers around like at car meets ?

Upholstery work seems more like side business, not sure you could find enough jobs to do 40 - 60 hours a week.

If the guy is out of money and has bills pilling up, that isn't good.