It's very unlikely that a person will find a divorce to be a complete surprise because there are usually signs that the marriage is on its last legs. Knowing these signs might help you to address them before the erode the marriage to the point of it becoming irreparable. If there's not any chance of improving things, knowing these signs can warn you that you should prepare for divorce.
One of the most important things to pay attention for is the connection you have with your spouse. If you feel like there isn't any affection and you're completely disengaged from them emotionally, there is a problem. There are many ways that this might manifest. One of these is that you just might realize that there isn't anything in the marriage worth fighting for.
A complete lack of willingness to do what it takes to save the marriage is a sign that it's so far gone that divorce is likely. If there is a hope for saving the marriage, you have to be willing to put in the effort.
Sometimes, the issues in the marriage lead to a lack of intimacy. Strong marriages come complete with physical and emotional intimacy on a regular basis. Oftentimes, these issues come slowly over time, so you might not realize it until you sit down to take a look at what's going on.
Once you realize that the marriage is over, you need to take steps to protect yourself. Thinking carefully about the options you have and how each will impact you can help you to make decisions.