I try to look at it a different way. Now you know where you stand with him and he can't ever rip you off or cost you money again, unless you're so soft that you invite him to again, and this also is your get out of jail card with him. You now have no obligation to help him, lend him money, do anything at all for him.
My girlfriend hates the way I cut people off and the way I don't forget when people cross us, because I never forget and even small things stay with me for a very long time. Nobody will burn me twice. I think this is a blessing fir you. Go out there and make a success of what you do and make him wish he had been a part of it.
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