You have a dispute that needs to be settled in civil court. The first option for you is to ask your partner for your fair share so that you can avoid court. That usually doesn't work, but is a necessary step. If you can't come to an agreement then file a civil suit. If you can prove that you put something into that home, then chances are that a judge a judge will make sure you get your fair share. There are likely various contracts involved with all this and it will all have to be sorted through. You can probably get a free consult with an attorney to determine your best course of action.