The Family Law Act recognises de-facto relationships.
The requirements to meet this definition is as follows:
You were in a relationship for at least 2 years;
At least one of the parties to the relationship was an ordinarily resident; and
both you and your former partner were ordinarily residents during at least one third of the period of the relationship; or
contributions were made in the form of financial, non-financial or to the welfare of the family.
Following the end of a de-facto relationship, parties must finalise their property settlement within 2 years from the date of separation.