1. Perform two imports.  One will bring in the constituents.  The second will link the spouse records.
  2. Import using the Constituent Batch.
  3. Only map Constituent Type, Lookup ID, First Name, Last Name, Address, City, State, Zip, Country, Address Type
  4. Once this batch has been committed, then you’ll want to import the spouse relationship.
  5. Next, Import using the Constituent Update Batch
  6. Only map Constituent Type, Lookup ID, First Name, Last Name, Spouse Lookup ID, Spouse First Name, Spouse Last Name, Spouse relationship, Spouse Reciprocal
*This should allow you to commit and import the spouse relationships, while only updating the previously imported records.