Always it breaks my heart when people end up in separation.
Why "always"? In many cases, divorce is a positive experience for both parties. Human beings are extremely complex creatures and constantly changing. Sometimes it's best for the marriage to end and both people to move on with their lives.
People seem to divorce because they think they have grown to different paths.
People did not use to divorce in the old days. There is a meme gone viral on Facebook which states: "We used to be the generation that did not throw away something that broke but we used to fix it" and the picture on the meme was very old couple who obviously have gone through the most stormiest weathers in their marriage and yet survived.
Divorce is giving up. It is giving up in front of the challenges instead of going through the pain and grow even stronger. I know what I am talking about from my personal experience. There have been several times when I felt in my heart I am married to the wrong person and I wish I have chosen otherwise.
Usually the change in a relationship starts from oneself, not from the other. In Zohar it says a woman is a moon and a man is the sun. What does this want to say? It is the sun that is the source of the light and the moon is only reflecting. In a marriage and relationship (marriage is actually a Jewish thing, not
required by God to the non-Jewish).
Divorce is allowed also in Torah, it is true. But in my opinion a person should not marry too easily and ponder well enough on what to do in the struggles. And often it is easy to blame the other part instead of taking responsibility oneself. That is in my opinion the reason why a person who divorces once very likely divorces second and possibly third time - one has not learned the lesson of not trying to change the other but change oneself instead... Divorce in my personal opinion is allowed when the other partner uses domestic violence, cheats etc (but then again, why in the first place marry a person who has tendency to such things, one should study the partner well enough before jumping into it).
But I think not much can be done if there is no motivation to continue (ie will to love). Marriage needs the will to love, that's the reason why they ask in the wedding ceremony "Are you
willing to love..." As long as there is will, there is a way. When there is no will, there is not also a way.