Where have all the love, passion, caring, understanding, harmony, great sex, excitement, support, comfort gone? Has marriage become a routine, or even a painful place where there's either silence, constant arguing, indifference, neglect, lack of understanding? Do you no longer recognize your spouse? Are you suspecting infidelity? Do you wish things were the way they used to be? You are not alone.
What's also important to grasp is that it's not, necessarily, the end of the road for your relationship.
There are reasons why you are in this situation today and there are ways to get out of it without a divorce.
This is not about staying together for the children (I don't think this alone is never a good reason to stay together unless you learn to stay together and love staying together); this is about learning to understand, love and live with your spouse all over again.

1. Understand that you 2 are communicating with each other even in silence and that neglecting what's being said (verbally and non-verbally) is a huge mistake if you wish to work out a strategy to transform your marriage.
   You need to learn to step in each other's shoes.
   Each brain works differently and the way we understand, see and perceive everything around us is different from person to person.
   No two people process the world the same way.
   So, you need to learn how to see the world from your partner's prospective.
   More on this later on.
   
2. Learn to rekindle the love you felt for each other when things were great.
   Break bad, depressing habits or routines you do together and try to spend time doing exciting things together.
   It could just be going for a bike ride or anything that you haven't done ever or in a long time but would like to do.
   Then, learn to elicit emotions from your partner a in a way that will allow transference onto you.
   Rekindle great memories, life dreams, and talk about it together as often as possible.
   Be excited together.
   More on this later.
   
3. Learn to understand who your partner truly is.
   Ask questions about his past before you, even childhood, then questions about his thoughts and fears, then questions about future life goals and dreams (and desires).
   Do it as a game and never, ever criticize him/her.
   Ask your partner to do this to you.
   

The above 3 ways will immediately change things between you and your spouse.