In absence of a written agreement aproperty agreement has the full capacity to screw you up. In such cases you cannot claim that your partner is paying less towards the bond. If there is legal understanding between the partners it is fine but if it does not exist then the best thing would be as per Jocelyn Newmarch:

It will be in both your interests if you are able to settle the issue amicably between you. You do have the option of going to court, provided you found a lawyer who argued that you have rights as a common-law spouse. However, the law in this regard is still unclear and, even if you were vindicated, you would still have costly lawyers’ fees to pay.




If property is all that matters then both of you should hold up the property practically so that both of you can profit from the investment. In the words of Newmarch: I would strongly suggest that the two of you draw up a contract to govern your investment partnership.
This will ensure that both of you understand the terms and obligations of the arrangement and prevent the partnership from turning sour.