Refusing to open a checking account does not require the Reg B adverse action notice, since no "credit" is involved. The only "adverse action" notice required when you refuse to open a checking account is the FCRA adverse action notice, which is required ONLY when information contained in a consumer report, as that is defined under FCRA, is the reason for the adverse action, i.e., the refusal to open the account, and the notice must go to the person whose consumer report was the reason for the adverse action. Here, the only FCRA notice required would be to the girlfriend. Of course you want to tell the other applicant why you refuse to open the account, but the FCRA adverse action is not required to the boyfriend.