You can renew your visa, even if your relationship with the Special Category visa holder has ended, provided that:
•you have maintained Australian residency; you must have been in Australia for a total of at least two years in the last five years
•you continue to meet standard health and character requirements
•you do not become the member of a family of another person (other than another Special Category visa holder)
•if you are currently outside Australia, you held this visa when you left Australia.