Happi,
IMO,
If this isn't some special situation you are setting yourself up for a tough road ahead. No matter how much work He throws at you if you can't make a decent wage out of it you lose. I've been there, and done that myself. He knows what He got out of you and will expect it everytime. When you try to raise your prices He will just find someone else.
It's possible that others that know him may give you a shot with some work, but they will expect the same out of you. Consider it a lesson learned and don't do it again, if anyone asks say that you made a mistake.
Bill
