A woman’s life changes tremendously after she gets married, especially if the parties never resided together before the wedding.
Once you get married, you are not only someone’s partner, but you (usually) become a homemaker. You are the cook, the cleaner, the doctor, the washing service, the “flashlight holder”, the assistant mechanic, etc.
You become accountable to and for your partner and your children.
These changes can either be or the better or for worse, depending on what you and your partner discussed before the wedding.
Take a look at this article on the questions you have to ask your partner before getting married.