Here’s what I’ve seen among my friends who have had marriages that didn’t make it.
-Getting married young. The amount of personal growth and change a person goes through in their 20’s is usually incredible. It can work, but the chances are good that the person who is right for you at age 22 is not the same person who is right for you at age 32.
-Rushing in because they’re sooo in love. Love’s great. Hooray love. Contrary to what the Beatles say, love is NOT all you need to make a marriage work. How will you really feel about that person’s annoying little habits, family, lack of career goals, penchant for weed smoking, habit of working 70 hours a week, handling of crises, etc after the initial lustful honeymoon phase?
-Thinking that getting hitched will solve problems. These are the same people who often decide that having a baby will solve their marital problems, which are often really the same problems they had before dating.
-Getting married because it’s what’s done in their culture. I have a friend from a small town who rushed into a failed marriage because at 25, she was considered old to be single.
-Not talking, talking, and talking some more about how they really envision their lives in the future. It’s one thing to say “Yeah! Let’s wait 10 years to have kids!” But when it really comes down to it, did they mean it?
-Not being single and figuring yourself out. I have friends who have pretty much never been alone and they define themselves by the person they’re with. That eventually gets old.
So, the TLDR version: Dating, living together, etc is all fine and dandy, but it’s not the actions that make a marriage.