The only thing you should be worried about is the length of time your partners visa is issued for. Whatever one is issued you will also get the right to live and work in Australia also but only for the same amount of time and only if you are officially a couple. I don't think Australia recognise defacto unions.
So if your partners visa is only valid for 2 years then so is yours. Few operators will hire you if there is a possibility that your visa might not be renewed.