You have just received what is commonly known as "experience". What do you do with it? Learn from your mistakes (get things in writing and signed beforehand n

You have just received what is commonly known as "experience". What do you do with it? Learn from your mistakes (get things in writing and signed beforehand next time, interview/evaluate the people you consider going into busines with, etc.), chalk it up and move on. There is little you can do in this case beyond picking up and starting over at something new.