Mimi has a wonderful "Bring Back a Lost Lover" Spell. You can find it on this page of the website: http://www.onewitch.com/shopping/sks2.html
It also helps to do some meditation. Do you want this exact man back? Or are you looking for happiness with a man who is like your former fiancee, but perhaps more stable and committed?
Spells are great for helping you get what you want... But it is very important to first decide if that is exactly what you want after all.
I wish you the best of luck.