In Zi Wei Dou Shu, a spouse is someone whom you have close contact with frequently, more than anyone else within your social circle. This could also be a partner whom you live-in with, without a proper marriage ceremony, or any legal means to justify a lawful marriage. Therefore, if a person has a girlfriend or boyfriend for over a period of time without lawfully being married, it is considered a marriage in Zi Wei Dou Shu.
In essense, if a Zi Wei Dou Shu chart indicates a probable failed marriage, we must understand that this include any previous long-term relationship that the person may have had to make a prediction on the current scenario.
The Spouse palace also indicates your spouse character, and if he/she is suitable to manifest good things in your life. At the other end, it could also indicate challenges in the well being of the relationship. There are many cases of good marriages, and failed marriages. However, it is not necessary to blame anyone of any thing negative since the person is born to experience good and bad, plus they have choices as well.