There's your answer in your reply. "He started the residential's on the side". That is basically saying he CANNOT be trusted! Get out of it before you regret it later. Go on you own, its better for you. If you don't know how to run a business, do some research. You went to college. Talking from experience in the past. I had a partner who wanted to go into a pizzaria business with me and being naive I coughed up 10k and never got it back.