If you’ve been together for more than 2 years then you will be in a defacto relationship. You don’t necessarily have to have been living with each other the entire time. There are a number of things to be looked at. There’s not always a “black and white” case to say when there is or isn’t a defacto relationship. However, if you have a child and the relationship is less than 2 years, then you will be considered to be in a defacto relationship.
If you’d like to know more about your particular situation then please call me.