Why don't people quit saying "marriage doesn't make a difference"?

A lot of people say that "marriage doesn't make a difference" to their relationship as to justify why they aren't married. But the real reason why they are avoiding marriage is because they are AFRAID of marriage. They lack confidence that they will stay by their partners forever so by avoiding marriage, they can leave whenever they feel like leaving.

If you liked someone enough, you would want to be married to them, put your own claim on the person you love. It will make a huge difference.
Why don't people quit saying "marriage doesn't make a difference"?
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