Your lawyer has a legal and ethical duty of confidentiality. According to the Colorado Rules of Professional Conduct:
"a lawyer shall not reveal information relating to the representation of a client."
Even after the attorney-client privilege has ended, the attorney still may not reveal any confidential information.
Lawyers face serious penalties for revealing something confidential without getting approval from their client (such as through a waiver) - even if the disclosure was an accident. Possible consequences include:
sanctions for ethical violations, including being disbarred; and
a civil claim for professional malpractice by the client against the attorney.
In some situations, an attorney may be required to reveal privileged information pursuant to a court order subpoena.