If two people love each other and want to get married...yes, then it is important.
Marriage is the bond that seals the bond of your love for each other.
That is something that you promise God and each other..that you will be with each other and love and support each other until the day you die.
Many people don't get married anymore because it is easier just to live together.
It's a very modern world we live in and many people choose not to get married but live together....but still make the same promises to each other. To support and love each other..forever.