Why would a Christian couple have a child and be together for 15 years but not be married?

Anonymous
I know a couple who have been together for 15 years and since they were both 13 who aren't married. They have a 10 year old child and have a baby on the way and were engaged a few years ago but they aren't engaged anymore. They are both Christians. Why would this be?
Why would a Christian couple have a child and be together for 15 years but not be married?
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