My fiancé and I bought a house together (ie: I paid for half of everything) but the mortgage is in his name. Needless to say, the original deed was in his name and we broke up before he could add me to it, though I've paid half since the house was purchased, and I have receipts for deposits, etc. What are my options now for recouping what I've put into the property, if any?

I believe that you have no legal interest in the property. The best that you might do is to sue him on the basis of the (verbal?) agreement between the two of you. His defense would probably be to consider this a rental arrangement. If the amount of money you have invested is sufficient to reasonably take the transaction out of the realm of a 'rental", you might be able to recover some of your money. I think that you should consult with a good attorney to check out your options.