I’m in a de facto relationship and we’ve separated. Is my property affected?

Under the Relationship Act, if you've been living in a relationship similar to marriage for at least 3 years (e.g. living together in the same property, with joint finances), then your property will normally be treated in the same way as property from an official marriage. 
The relationship period considered may be shorter than 3 years if you have a child together, or if one partner has made significant financial contributions to the relationship (such as buying a house) and would be disadvantaged by an equal split.