He who laughs last laughs best! The only way to win is to do or say nothing to her and to be to busy to see her! (Period) If you do meet her you'll be sorry!
Harvey7. 
I'm super new here and this is my first reply but seriously the above comment is so childish! I had a similar situation, my ex- and I were engaged and he pulled that "no contact" garbage. It is really immature and hurtful to both parties, whether you realize it or not. When you really learn how to love someone, pride and "getting the last laugh" are never considerations.