In this section, “spouse” includes a former spouse. Except as provided in subsection (c) of this section, one spouse is not competent to disclose any confidential communication between the spouses occurring during their marriage. A spouse who is the alleged victim is competent to disclose a confidential communication between spouses occurring during their marriage in a criminal action in which one spouse is charged with a crime against the other spouse. A spouse may not be compelled to testify to a confidential communication under this subsection.