No you dont its called Spousal privilege which comprises two parts:

Part One:::The marital confidences privilege (or marital communications privilege) is a form of privileged communication protecting the contents of confidential communications between a married couple. This privilege applies in civil and criminal cases. When applied, a court may not compel one spouse to testify against the other concerning confidential communications made during marriage.

Part Two:::The spousal testimonial privilege (or spousal immunity) can be used to prevent any party in a civil/criminal case from calling the defendant's spouse to testify against the defendant about any topic.