Regardless of the house price situation, you might like to consider the following -
Do you want to stay living in that house or would you like to move to a new area and get a fresh start?
Would the house require major upgrading in the near future which you might not be able to afford on your own?
Do you have children who might or might not want to move?
Do you think you would be happy to continue living in what was your family home?
And of course, can you afford to buy your ex out? If you can't, then selling may be your only option.
Best of luck, whatever you decide.