HOW CAN I NOT INCLUDE MY SPOUSE IN MY APPLICATION? i need answers please...

Hi! I am under the Live-in Caregiver class and done with the program. Both my hubby and son are here, they both came from US. Couple moths ago me and my hubby decided to call it quits, and I have my son with me. I just recently filed a Permanent Residence application and I did not include my (ex) hubby in the application though I declared I am still married and also extended their Visitor status here. Couple days ago the CIC called me and they require me to submit a separate application for my (ex) hubby and he needs to submit a Police Clearance and undergo medical exams as well. My question is, how can i not include my (ex) hubby in the application so he wont go with the process of background checks and medical exams? coz I really am not sure where he is right now. What steps are appropriate with my situation? I wanted to hire an Immigration Lawyer but I am on a tight budget as well considering I am the only one providing for our child. Please help me I really need help....