Deed to the house in both names

Filed for divorce 18’ respondent never responded. Have no idea where responded is, just up and left June of 17’ leaving me with the house, the kids & all financial responsibilities. The Deed to the house is in both our names but the loan is in the respondent name only. I have made every payment on my own since then. Any suggestions of what I should do? Can I just file a default now that it’s been more then 30 days? How do I save the house?
Thank you in advance.