Are you saying you are an authorized user (not sure what you mean by “secondary”)? If you were an authorized user, all you need do is call the credit card issuer and ask to be removed from the card. If you mean you were a joint user or co-signer, then you may be responsible for the debt. If you were an authorized user and have yourself removed from the account, your credit score should return to its earlier levels.
A credit report includes information on where you live, how you pay your bills, and whether you’ve been sued or have filed for bankruptcy. Nationwide credit reporting companies sell the information in your report to creditors, insurers, employers, and other businesses that use it to evaluate your applications for credit, insurance, employment, or renting a home.