Nothing. Let him be, and BE READY with your list of boundaries/dealbreakers so that you're prepared if he says "What will it take?" for him to come back.
Be civil the next 24-72 hours, but do NOT kiss his ass, and do NOT get all clingy and "melty woman" on him. Keep yourself occupied. You want to convey a sense of "I hope you'll do the right thing, but I'M going to be fine, either way."
