Is this your standard practice for all applicants? Do you treat all applicants, married or unmarried, the same in similar circumstances? Denying them as a co-borrower but still requiring them to become legally obligated on the loan could also be construed as a deceptive act and practice. Sounds to me like this is a foreclosure waiting to happen, with a potential law suit on behalf of the "co-borrower".
We effectively deny a cosigner on a loan - either informing them or not informing them
We are denying them as a coborrower -
If you are denying them based on their credit report then hopefully you are furnishing them the required FCRA notice.
Also, if you're not informing them then are you really "effectively" denying them?