I agree with NewEveryDay. Give him the letter again. Be clear that these are your rock solid boundaries. Don't even hint that that marrying you would allow him to bypass all your other conditions. You do not want to be married to a drunk with anger management problems that chases every female who smiled at him. Let him know that you understand this is going to be hard for him. Tell him 'faint heart never won fair lady'. Smile sweetly, shut the door. Change your locks and start a proper plan B.

3 adult children
Divorced - he was a serial adulterer
Now remarried, thank you MB
(formerly lied_to_again)