My thought is that you ought to give him another chance, but there are some restrictions. Don't write any letters, emails, etc. Call him up. Tell him you appreciate the card he sent. Suggest that it would be good to see him again. Let him ask you out.
If he wants to go out with you again, no sex. Repeat. No sex. No mashing. No groping. Just a nice casual time to get reacquainted. If all he wants is a booty call for those slow evenings, then you can move on. People get themselves into more emotional trouble along with all kinds of other problems because of promiscuous sex.
If you go out with him a second time, you need to explain to him that you do not appreciate his past actions and expect him to treat you with respect. If he would like to begin dating you again he must terminate his cutesy little facebook friendships, along with all his other seemingly immature opposite sex pursuits.
Then, forget about the money you owe him. If he really loves you it does not matter.
Finally, you need to decide if this man is worth marrying. If not, move on.
Hey, I'm on your side!
Carlos Augustine
carlos, you can't do that. sorry.