You Were Invited to a Wedding of a Co-Worker

You were invited to a wedding of a co-worker. A month after the wedding, you see the spouse of your co-worker at the community market and she introduced you to her "boyfriend." She explained that she had only married your co-worker in order to allow him to obtain green-card status and that their divorce was in process. Discuss the ethical issue you face and whether you need to take any action because of what you have learned.