I realized that what we expect from marriage and the things and roles we give for granted are based on our personal experiences, and depending on what family you come from, what is normal for one, can be a disappointment for the other.
Leaving together triggers different habits than when you date, and it requires adjustment for both at the beginning.
It's a learning curve about new aspects of each other.
One thing is sure: people don't change. So if you are getting married hoping the other one will give up some aspects of the personality: not going to happen. Ever.